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People mourn during a commemoration ceremony in held in the Rememberance Garden of Madrid's Retiro Park on March 11, 2014 for the victims of the Madrid train bombings marking the10th year anniversary of the attacks that claimed 191 lives and injured more than 1800 others. On March 11, 2004 at 7:40 am, 10 bombs exploded on board four packed commuter trains in Madrid in an attack claimed by the Al-Qaeda terror network, which said they were punishment for Spain's role in the US-led invasion of Iraq. JAVIER SORIANO/AFP/Getty Images ( 527952455 )

MADRID, SPAIN - MARCH 11: (L-R) Princess Elena of Spain, Princess Letizia of Spain, Queen Sofia of Spain and King Juan Carlos of Spain greet Spanish Prime Minister Mariano Rajoy and wife Elvira Fernandez before the 10th anniversary Mass to pay homage to the victims of the Madrid train bombings at the Almudena Cathedral on March 11, 2014 in Madrid, Spain. (Photo by Carlos Alvarez/Getty Images) ( 477808297 )

Antonia Santiago Garcia holds a phot of her late daughter Maria Dolores Duran Santiago, who died multiple terror attacks, during a commemoration ceremony in held in the Rememberance Garden of Madrid's Retiro Park on March 11, 2014 for the victims of the Madrid train bombings marking the10th year anniversary of the attacks that claimed 191 lives and injured more than 1800 others. On March 11, 2004 at 7:40 am, 10 bombs exploded on board four packed commuter trains in Madrid in an attack claimed by the Al-Qaeda terror network, which said they were punishment for Spain's role in the US-led invasion of Iraq. JAVIER SORIANO/AFP/Getty Images ( 527953079 )

People place flowers into trees during a commemoration ceremony in held in the Rememberance Garden of Madrid's Retiro Park on March 11, 2014 for the victims of the Madrid train bombings marking the10th year anniversary of the attacks that claimed 191 lives and injured more than 1800 others. On March 11, 2004 at 7:40 am, 10 bombs exploded on board four packed commuter trains in Madrid in an attack claimed by the Al-Qaeda terror network, which said they were punishment for Spain's role in the US-led invasion of Iraq. JAVIER SORIANO/AFP/Getty Images ( 527953106 )

MADRID, SPAIN - MARCH 11: Pilar Manjon, president of the 11 March Victims of Terrorism Association hugs terrorism affected woman during a memorial for the victims of Madrid train bombings outside El Pozo train station during the 10th anniversary on March 11, 2014 in Madrid, Spain. The worst ever terrorist attack to happen in Spain killed 192 people and injured another 1,857, after devices exploded in four commuter trains heading to Atocha Railway Station in the early hours of March 11, 2004. Many of those affected are now suffering with financial problems. Former Spanish Prime Minister Jose Maria Aznar and his government supported that the attack was made by ETA but the judicial investigation dismounted this theory. (Photo by Pablo Blazquez Dominguez/Getty Images) ( 477916127 )

Candles are lit as people visit the Atocha Bombing Memorial, in Madrid, Spain, Tuesday March 11, 2014, in remembrance of those killed and injured in the Madrid train bombings marking the 10th anniversary of Europe's worst Islamic terror attack. The attackers targeted four commuter trains with 10 shrapnel-filled bombs concealed in backpacks during morning rush hour on March 11, 2004. (AP Photo/Andres Kudacki) ( Spain Madrid Bombings )

MADRID, SPAIN - MARCH 11: A security man visits the memorial monument for the victims of Madrid train bombings at Atocha railway station during the 10th anniversary on March 11, 2014 in Madrid, Spain. The worst ever terrorist attack to happen in Spain killed 192 people and injured another 1,857, after devices exploded in four commuter trains heading to Atocha Railway Station in the early hours of March 11, 2004. Many of those affected are now suffering with financial problems. Former Spanish Prime Minister Jose Maria Aznar and his government supported that the attack was made by ETA but the judicial investigation dismounted this theory. (Photo by Pablo Blazquez Dominguez/Getty Images) ( 477833201 )

People visit the Atocha Bombing Memorial, in Madrid, Spain, Tuesday March 11, 2014, in remembrance of those killed and injured in the Madrid train bombings marking the 10th anniversary of Europe's worst Islamic terror attack. The attackers targeted four commuter trains with 10 shrapnel-filled bombs concealed in backpacks during morning rush hour on March 11, 2004. (AP Photo/Andres Kudacki) ( Spain Madrid Bombings )

People react as they visit the Atocha Bombing Memorial, in Madrid, Spain, Tuesday, March 11, 2014, in remembrance of those killed and injured in the Madrid train bombings and marking the 10th anniversary of Europe's worst Islamic terror attack. The attackers targeted four commuter trains with 10 shrapnel-filled bombs concealed in backpacks during morning rush hour on March 11, 2004. (AP Photo / Andres Kudacki) ( Spain Madrid Bombings )

A man waits for the train in Atocha train station in Madrid, Spain, Tuesday, March 11, 2014, during the remembrance of those killed and injured in the Madrid train bombings marking the 10th anniversary of Europe's worst Islamic terror attack. The attackers targeted four commuter trains with 10 shrapnel-filled bombs concealed in backpacks during morning rush hour on March 11, 2004. (AP Photo/Andres Kudacki) ( Spain Madrid Bombings )

MADRID, SPAIN - MARCH 11: People wait for trains at Atocha railway station during the 10th anniversary of Madrid train bombings on March 11, 2014 in Madrid, Spain. Spain's worst terrorist attack killed 192 people and injured another 1,857 in the early hours of March 11, 2004, after devices exploded in four commuter trains heading to Atocha Railway Station. Former Spanish Prime Minister Jose Maria Aznar and his government said the attack was carried out by the ETA, a Basque separatist group, but the judicial investigation discounted the theory. (Photo by Pablo Blazquez Dominguez/Getty Images) ( 477844999 )

MADRID, SPAIN - MARCH 11: People wait for trains at Atocha railway station during the 10th anniversary of Madrid train bombings on March 11, 2014 in Madrid, Spain. Spain's worst terrorist attack killed 192 people and injured another 1,857 in the early hours of March 11, 2004, after devices exploded in four commuter trains heading to Atocha Railway Station. Former Spanish Prime Minister Jose Maria Aznar and his government said the attack was carried out by the ETA, a Basque separatist group, but the judicial investigation discounted the theory. (Photo by Pablo Blazquez Dominguez/Getty Images) ( 477845007 )

MADRID, SPAIN - MARCH 11: People gather during a memorial for the victims of Madrid train bombings outside El Pozo train station during the 10th anniversary on March 11, 2014 in Madrid, Spain. The worst ever terrorist attack to happen in Spain killed 192 people and injured another 1,857, after devices exploded in four commuter trains heading to Atocha Railway Station in the early hours of March 11, 2004. Many of those affected are now suffering with financial problems. Former Spanish Prime Minister Jose Maria Aznar and his government supported that the attack was made by ETA but the judicial investigation dismounted this theory. (Photo by Pablo Blazquez Dominguez/Getty Images) ( 477916153 )

MADRID, SPAIN - MARCH 11: Candles are placed for the victims of Madrid train bombings at El Pozo train station during the 10th anniversary on March 11, 2014 in Madrid, Spain. The worst ever terrorist attack to happen in Spain killed 192 people and injured another 1,857, after devices exploded in four commuter trains heading to Atocha Railway Station in the early hours of March 11, 2004. Many of those affected are now suffering with financial problems. Former Spanish Prime Minister Jose Maria Aznar and his government supported that the attack was made by ETA but the judicial investigation dismounted this theory. (Photo by Pablo Blazquez Dominguez/Getty Images) ( 477916131 )

Rescue workers cover up bodies by a bomb damaged passenger train following a number of explosions on trains in Madrid, Spain, March 11, 2004, just three days before Spain's general elections, killing more than 170 rush-hour commuters and wounding more than 500 in Spain's worst terrorist attack ever. (AP Photo/Paul White) ( SPAIN EXPLOSION )

Policemen intervene after a train exploded at the Atocha train station in Madrid 11 March 2004. At least 173 people were killed and some 600 injured early 11 March 2004 in near-simultaneous explosions on three trains in Madrid at the height of morning commuter traffic, the Spanish interior ministry said. In what appeared to be a deliberate attack staged only 72 hours ahead of Spanish general elections, the blasts went off on a long-distance high-speed carrier and two suburban trains packed with commuters. CHRISTOPHE SIMON/AFP/Getty Images ( PAR2004031124218 )

Rescue workers evacuate an injured person after a train exploded at the Atocha train station in Madrid 11 March 2004. At least 173 people were killed and some 600 injured early 11 March 2004 in near-simultaneous explosions on three trains in Madrid at the height of morning commuter traffic, the Spanish interior ministry said. In what appeared to be a deliberate attack staged only 72 hours ahead of Spanish general elections, the blasts went off on a long-distance high-speed carrier and two suburban trains packed with commuters. PIERRE-PHILIPPE MARCOU/AFP/Getty Images ( PAR2004031124334 )

Police officers run after an alert near the Atocha train station in Madrid 11 March 2004. At least 131 people were killed and some 400 injured early 11 March 2004 in near-simultaneous explosions on three trains in Madrid at the height of morning commuter traffic, the Spanish interior ministry said. In what appeared to be a deliberate attack staged only 72 hours ahead of Spanish general elections, the blasts went off on a long-distance high-speed carrier and two suburban trains packed with commuters. CHRISTOPHE SIMON/AFP/Getty Images ( PAR2004031123840 )

Victims comfort each other after a train exploded at the Atocha train station in Madrid 11 March 2004. At least 198 people were killed and more than 1,400 wounded in bomb attacks on four commuter trains. RICARDO CASES/AFP/Getty Images ( PAR2004031224955 )

Victims are evacuated after a train exploded at the Atocha train station in Madrid 11 March 2004. At least 198 people were killed and more than 1,400 wounded in bomb attacks on four commuter trains. RICARDO CASES/AFP/Getty Images ( PAR2004031224952 )

Medics evacuate victims of a train blast from the Atocha train station in Madrid 11 March 2004. At least 131 people were killed and some 400 injured early 11 March 2004 in near-simultaneous explosions on three trains in Madrid at the height of morning commuter traffic, the Spanish interior ministry said. In what appeared to be a deliberate attack staged only 72 hours ahead of Spanish general elections, the blasts went off on a long-distance high-speed carrier and two suburban trains packed with commuters. CHRISTOPHE SIMON/AFP/Getty Images ( PAR2004031123835 )

Bodies of victims are evacuated after a train exploded near the Atocha train station in Madrid 11 March 2004. At least 131 people were killed and some 400 injured early 11 March 2004 in near-simultaneous explosions on three trains in Madrid at the height of morning commuter traffic, the Spanish interior ministry said. In what appeared to be a deliberate attack staged only 72 hours ahead of Spanish general elections, the blasts went off on a long-distance high-speed carrier and two suburban trains packed with commuters. CHRISTOPHE SIMON/AFP/Getty Images ( PAR2004031123971 )

The wreckage of a Spanish intercity train destroyed by an explosion lies on the track at Atocha railway station in Madrid Spain, Thursday, March 11, 2004. A series of explosions in the city killed at least 62 people and injured dozens. (AP Photo/Alvaro Hernandez) ( SPAIN BOMBINGS )

Rescue workers remove victims at the Atocha train station following a blast there, after explosions rocked three train stations in Madrid Thursday, March 11, 2004, just three days before Spain's general elections. The blasts killed more than 173 rush-hour commuters and wounded more than 500 in Spain's worst terrorist attack ever. (AP Photo/Peter Dejong) ( SPAIN BOMBINGS )

Victims wait for assistance after a train exploded at the Atocha train station in Madrid 11 March 2004. At least 198 people were killed and more than 1400 wounded in bomb attacks on four commuter trains. RICARDO CASES/AFP/Getty Images ( PAR2004031225090 )

A victim is comforted by a policeman after a train exploded at the Atocha train station in Madrid 11 March 2004. At least 198 people were killed and more than 1,400 wounded in bomb attacks on four commuter trains. RICARDO CASES/AFP/Getty Images ( PAR2004031224958 )

A Spanish rescue worker counts the bodies removed from one of the commuter trains following a number of explosions on trains in Madrid, in this March 11, 2004, photo. A Spanish judge on Tuesday, April 11, 2006, handed down the first indictments in the Madrid train bombings of 2004, charging 29 people with murder, terrorism or other crimes after a two-year probe. (AP Photo/Peter DeJong) ( SPAIN BOMBINGS )

A rescue worker wipes his eyes after a train exploded at the Atocha train station in Madrid 11 March 2004. At least 173 people were killed and some 600 injured early 11 March 2004 in near-simultaneous explosions on three trains in Madrid at the height of morning commuter traffic, the Spanish interior ministry said. In what appeared to be a deliberate attack staged only 72 hours ahead of Spanish general elections, the blasts went off on a long-distance high-speed carrier and two suburban trains packed with commuters. PIERRE-PHILIPPE MARCOU/AFP/Getty Images ( PAR2004031124478 )

A person lights a candle as people gather at la Puerta del Sol place in the center of Madrid after a train exploded at the Atocha train station, 11 March 2004. At least 173 people were killed and some 600 injured early 11 March 2004 in near-simultaneous explosions on three trains in Madrid at the height of morning commuter traffic, the Spanish interior ministry said. In what appeared to be a deliberate attack staged only 72 hours ahead of Spanish general elections, the blasts went off on a long-distance high-speed carrier and two suburban trains packed with commuters. JACK GUEZ/AFP/Getty Images ( PAR2004031124599 )

U.S. President George Bush, center, bows his head during the playing of "Taps" after laying a wreath for the victims of the railway bombings in Madrid, Spain at the Spanish ambassador's residence Friday, March 12, 2004 in Washington. (AP Photo/Charles Dharapak) ( BUSH US SPAIN BOMBINGS )

A young girl holds a Spanish flag with a black ribbon, in the courtyard of the residence of the Spanish ambassador to Portugal, Lisbon, Friday, March 12 2004, where people gathered for a minute's silence for the victims of Thursday's railway bombings in Madrid, Spain. (AP Photo/Armando Franca) ( PORTUGAL SPAIN BOMBINGS )

Hundreds of thousands of people fill the central Cibeles square in Madrid Friday March 12, 2004, during a demonstration to protest the numerous attacks on trains in the Spanish capital that killed nearly 200 people and injured at least another 1,400. (AP Photo/Peter Dejong) ( SPAIN BOMBINGS TOPIX )

A bouquet of flowers has been placed along with some candles at a memorial in Alcala de Henares train station in tribute to the victims who died in the madrid bombings ten years ago in Alcala de Henares, Madrid, Spain, 11 March 2014. A total of 191 people died and over 1,800 were injured after several islamist terrorists placed 11 explosive devices which blew up inside four commuter trains heading Atocha railway station downtown Madrid on 11 March 2004. EPA/FERNANDO VILLAR ( SPAIN MADRID BOMBINGS ANNIVERSARY )