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Rescuers search for survivors at the scene where the Maxima supermarket roof collapsed in Riga on November 22, 2013. AFP PHOTO/ILMARS ZNOTINS/AFP/Getty Images ( 524898290 )

Rescuers search for survivors at the scene where the Maxima supermarket roof collapsed in Riga on November 22, 2013. AFP PHOTO/ILMARS ZNOTINS/AFP/Getty Images ( 524898302 )

Rescue workers sift through parts of the roof construction as rescue works are continued at the site of the 21 November 'Maxima' supermarket roof collapse in Riga, 23 November 2013. Five Latvian construction firms on 23 November said their work was not to blame for the roof collapse of the supermarket in Riga, in which at least 53 people have been killed. Latvian police chief Ints Kuzis gave three possible reasons for the collapse: the structure of the building had been poorly analyzed, ongoing construction, and poor planning. The government excluded the possibility that natural catastrophe or an act of terrorism had caused the accident. The Maxima supermarket in central Riga was full of shoppers when the roof caved in late on 21 November. EPA/VALDA KALNINA ( LATVIA ACCIDENTS ROOF COLLAPSE AFTERMATH )

Passers by react outside the collapsed Maxima supermarket in Riga, Latvia, Saturday, Nov. 23, 2013. Scores of people have died, including three firefighters, after an enormous section of roof collapsed at a Latvian supermarket in the country's capital, emergency medical officials said Friday. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

People lighted candles at the scene where the Maxima supermarket roof collapsed on November 23, 2013 in Riga, caving in on shoppers. AFP PHOTO / ILMARS ZNOTINS/AFP/Getty Images ( 524920880 )

Cars parked outside the 'Maxima' supermarket, after its roof collapsed in Riga, Latvia, 21 November 2013. EPA/EMIL DESJATNIKOV ( LATVIA SUPERMARKET ROOF COLLAPSE )

People lay flowers and light candles in front of the Maxima supermarket in Riga, Friday, Nov. 22, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

Rescue workers outside the Maxima supermarket, after its roof collapsed in Riga, Latvia, 21 November 2013. EPA/EMILS DESJATNIKOVS ( LATVIA SUPERMARKET ROOF COLLAPSE )

Passers by react outside the collapsed Maxima supermarket in Riga, Latvia, Saturday, Nov. 23, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

Police tape cordons off an area around the Maxima supermarket as rescue work is underway after its roof collapsed, in Riga, Latvia, 22 November 2013. EPA/VALDA KALNINA ( LATVIA ACCIDENTS ROOF COLLAPSE )

Rescue work is underway outside the Maxima supermarket after its roof collapsed, in Riga, Latvia, 22 November 2013. EPA/VALDA KALNINA ( LATVIA ACCIDENTS ROOF COLLAPSE )

Debris lies in front of the Maxima supermarket during the rescue operation after its roof collapsed, in Riga, Latvia, 22 November 2013. EPA/VALDA KALNINA ( LATVIA ACCIDENTS ROOF COLLAPSE )

Rescue helpers sift through parts of the roof construction as rescue works are continued at the site of the 21 November 'Maxima' supermarket roof collapse in Riga, 23 November 2013. EPA/VALDA KALNINA ( LATVIA ACCIDENTS ROOF COLLAPSE AFTERMATH )

People lay down flowers and candles at the accident site of a collapsed Maxima supermarket in Riga on November 23, 2013, where the roof of the building caved in on shoppers on November 21. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524927720 )

Rescue helpers sift through parts of the roof construction as rescue works are continued at the site of the 21 November 'Maxima' supermarket roof collapse in Riga, 23 November 2013. EPA/VALDA KALNINA ( LATVIA ACCIDENTS ROOF COLLAPSE AFTERMATH )

Candles and flowers are laid in tribute to the victims of the roof collapse at Maxima supermarket in Riga, Latvia, 23 November 2013. EPA/VALDA KALNINA ( LATVIA SUPERMARKET ROOF COLLAPSE )

Paramedics remove a corpse from the rubble of Maxima supermarket in Riga, Latvia, 23 November 2013. EPA/VALDA KALNINA ( LATVIA SUPERMARKET ROOF COLLAPSE )

Candles and flowers are laid in tribute to the victims of the roof collapse at Maxima supermarket in Riga, Latvia, 23 November 2013. EPA/VALDA KALNINA ( LATVIA SUPERMARKET ROOF COLLAPSE )

People put flowers and light candles in front of the Maxima supermarket in Riga, Latvia, Saturday, Nov. 23, 2013. Scores of people have died, including three firefighters, after an enormous section of roof collapsed at a Latvian supermarket in the country's capital, emergency medical officials said Friday. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

Rescue workers search debris of the Maxima supermarket in Riga, Latvia, Saturday, Nov. 23, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

People lay flowers and light candles in front of the Maxima supermarket in Riga, Friday, Nov. 22, 2013. Hordes of shoppers were picking up food after work in the Latvian capital when an enormous section of the supermarket's roof caved in. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

Rescue workers search debris of the Maxima supermarket in Riga, Latvia, Saturday, Nov. 23, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

A woman lights a candle near the collapsed shopping centre in Riga, Latvia, Friday, Nov. 22, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

Rescue workers search debris of the Maxima supermarket in Riga, Latvia, Saturday, Nov. 23, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

A woman holds a candles and flowers outside the collapsed Maxima supermarket in Riga, Latvia, Friday, Nov. 22, 2013. The reason for the collapse during shopping rush-hour Thursday was still not known but rescue and police officials said that possible theories include building's design flaws and poor construction work. (AP Photo/ Roman Koksarov) ( Latvia Roof Collapse )

Rescue workers carry a stretcher with a victim's body outside the Maxima supermarket in Riga, Latvia, Friday, Nov 22, 2013. (AP Photo/Maris Morkans) ( Latvia Roof Collapse )

A late Thursday, Nov. 21, 2013 view of the collapsed Maxima supermarket in Riga, Latvia. (AP Photo/ Maris Morkans) ( Latvia Roof Collapse )

An Orthodox priest prays outside the collapsed Maxima supermarket in Riga, Latvia, Friday, Nov. 22, 2013. (AP Photo/ Roman Koksarov) ( Latvia Roof Collapse )

Rescue workers search the debris of the Maxima supermarket in Riga, Latvia, Saturday, Nov. 23, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

Passers by react outside the collapsed Maxima supermarket in Riga, Latvia, Thursday, Nov. 21, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

A late Thursday, Nov. 21, 2013 view of a rescue operation outside collapsed Maxima supermarket in Riga, Latvia. (AP Photo/ Maris Morkans) ( Latvia Roof Collapse )

Rescue workers search debris of the Maxima supermarket in Riga, Latvia, Friday, Nov. 22, 2013. (AP Photo/ Roman Koksarov) ( Latvia Roof Collapse )

Passers by react outside the collapsed Maxima supermarket in Riga, Latvia, Saturday, Nov. 23, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

Debris, foreground,which was removed by rescue teams during a search for victims at the Maxima supermarket in Riga, Latvia, Friday, Nov. 22, 2013. (AP Photo/ Roman Koksarov) ( Latvia Roof Collapse )

A view of collapsed Maxima supermarket in Riga, Latvia, Friday, Nov. 22, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

Rescuers search for survivors on November 21, 2013 under the rubble at the Maxima supermarket in Riga, after a roof collapsed. ILMARS ZNOTINS/AFP/Getty Images ( 524875153 )

A woman speaks on the phone as she waits foe news at the scene where the Maxima supermarket roof collapsed in Riga on November 22, 2013. AFP PHOTO/ILMARS ZNOTINS/AFP/Getty Images ( 524897886 )

People wait for news at the scene where the Maxima supermarket roof collapsed in Riga on November 22, 2013. AFP PHOTO/ILMARS ZNOTINS/AFP/Getty Images ( 524897919 )

Rescuers search for survivors at the scene where the Maxima supermarket roof collapsed in Riga on November 22, 2013. AFP PHOTO/ILMARS ZNOTINS/AFP/Getty Images ( 524898526 )

People lay down flowers and candles at the accident site of a collapsed Maxima supermarket in Riga on November 23, 2013, where the roof of the building caved in on shoppers on November 21. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524927713 )

Rescuers search for survivors at the scene where the Maxima supermarket roof collapsed in Riga on November 22, 2013. AFP PHOTO/ILMARS ZNOTINS/AFP/Getty Images ( 524898579 )

A man waits for news at the scene where the Maxima supermarket roof collapsed in Riga on November 22, 2013. AFP PHOTO/ILMARS ZNOTINS/AFP/Getty Images ( 524899679 )

A woman lights a candle near the collapsed shopping centre in Riga on November 22, 2013. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524908767 )

Candles were lit in front of the collapsed shopping centre in Riga on November 22, 2013. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524908834 )

People leave flowers and candles at the scene where the Maxima supermarket roof collapsed in Riga on November 22, 2013. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524909666 )

People carry candles at the scene where the Maxima supermarket roof collapsed in Riga on November 22, 2013. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524909672 )

Rescuers search for survivors at the scene where the Maxima supermarket roof collapsed in Riga on November 23, 2013. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524922828 )

People leave candles at the scene where the Maxima supermarket roof collapsed in Riga on November 23, 2013. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524922842 )

A man lights a candle near a barricade surrounding the Maxima supermarket in Riga on November 23, 2013, after the roof of the building caved in on shoppers on November 21. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524923129 )

Paintings and flowers are fixed on a fence near the accident site of a collapsed Maxima supermarket in Riga on November 23, 2013, where the roof of the building caved in on shoppers on November 21. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524927649 )

People lay flowers and candles at the accident site of a collapsed Maxima supermarket in Riga on November 23, 2013, where the roof of the building caved in on shoppers on November 21. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524927666 )

Flowers and candles are laid down at the accident site of a collapsed Maxima supermarket in Riga on November 23, 2013, where the roof of the building caved in on shoppers on November 21. AFP PHOTO / PETRAS MALUKAS/AFP/Getty Images ( 524927728 )

A view of collapsed Maxima supermarket in Riga, Latvia, Saturday, Nov. 23, 2013. (AP Photo/Mindaugas Kulbis) ( Latvia Roof Collapse )

Rescuers stand on November 23, 2013 in the Maxima supermarket in Riga, after a roof collapsed caving in on shoppers on November 21. AFP PHOTO / ILMARS ZNOTINS/AFP/Getty Images ( 524920928 )

Rescuers search for survivors on November 23, 2013 at the Maxima supermarket in Riga, after a roof collapsed caving in on shoppers. AFP PHOTO / ILMARS ZNOTINS/AFP/Getty Images ( 524920888 )

Rescuers search for survivors on November 23, 2013 at the Maxima supermarket in Riga, after a roof collapsed caving in on shoppers. AFP PHOTO / ILMARS ZNOTINS/AFP/Getty Images ( 524920843 )