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Policemen clear the area where a Carabiniere police officer was shot by an apparently disturbed man, on April 28, 2013 in Rome, outside the palazzo Chigi, the Italian Prime minister offices, while the country's new ministers were being sworn in. Two policemen were wounded, as well as a passerby, in the shooting. The attacker, named by Italian media as businessman Luigi Preiti, 49, was tackled to the ground by by police as witnesses fled the scene. FILIPPO MONTEFORTE/AFP/Getty Images ( 519315750 )

An Italian policeman is carried away by paramedics after two policemen were wounded on April 28, 2013 during a shooting outside the palazzo Chigi, the Italian Prime minister offices, as the country's new ministers were being sworn in. GABRIEL BOUYS/AFP/Getty Images ( 519313820 )

A policeman is helped after being shot on April 28, 2013 in Rome, outside the palazzo Chigi, the Italian Prime minister offices, while the country's new ministers were being sworn in. GABRIEL BOUYS/AFP/Getty Images ( 519314064 )

A man believed to be the assailant lies on the ground detained by police after a shootout outside the Chigi Premier's office, in Rome, Sunday, April 28, 2013. Two paramilitary police officers were shot and wounded outside the Italian premier's office as the new leader Enrico Letta was sworn in about a kilometer (half-mile) away. It was unclear if there was any connection between the events. (AP Photo/Mauro Scrobogna, Lapresse) ( Italy Politics Shooting )

Italian police cars are seen around the area where gunshots were fired, in front of Chigi Palace, in Rome April 28, 2013. Two police officers were shot and wounded outside the Italian prime minister's office on Sunday as Enrico Letta's new government was being sworn in around a km (0.62 miles) away at the president's palace, RAI state television reported. REUTERS/Remo Casilli ( ITALY-VOTE/OATH )

Policemen stand near the area where a Carabiniere police officer was shot by an apparently disturbed man, on April 28, 2013 in Rome, outside the palazzo Chigi, the Italian Prime minister offices, while the country's new ministers were being sworn in. Two policemen were wounded, as well as a passerby, in the shooting. The attacker, named by Italian media as businessman Luigi Preiti, 49, was tackled to the ground by by police as witnesses fled the scene. FILIPPO MONTEFORTE/AFP/Getty Images ( 519315620 )

An ambulance leaves the area where a Carabiniere police officer was shot by an apparently disturbed man, on April 28, 2013 in Rome, outside the palazzo Chigi, the Italian Prime minister offices, while the country's new ministers were being sworn in. Two policemen were wounded, as well as a passerby, in the shooting. The attacker, named by Italian media as businessman Luigi Preiti, 49, was tackled to the ground by by police as witnesses fled the scene. FILIPPO MONTEFORTE/AFP/Getty Images ( 519315713 )

A policeman receives assistance after being shot on April 28, 2013 in Rome, outside the palazzo Chigi, the Italian Prime minister offices, while the country's new ministers were being sworn in. GABRIEL BOUYS/AFP/Getty Images ( 519314130 )

Carabinieri police and Guardia di Finanza stand as they patrol around the area where gunshots were fired, in front of Chigi Palace, in Rome April 28, 2013. Two police officers were shot and wounded outside the Italian prime minister's office on Sunday as Enrico Letta's new government was being sworn in around a km (0.62 miles) away at the president's palace, RAI state television reported. REUTERS/Remo Casilli ( ITALY-VOTE/OATH )

A doctor carriers a stretcher after a Carabiniere police officer was shot by a man in front of Chigi Palace in Rome on April 28, 2013. Gunshots were fired in front of the Italian prime minister's office in Rome on Sunday as the new government of Enrico Letta was being sworn in at the president's palace, Quirinale, around a kilometer away. FILIPPO MONTEFORTE/AFP/Getty Images ( 519315505 )

Ambulances arrive to take away two policemen who were shot on April 28, 2013 outside the Italian Prime ministers office in Rome. The incident occurred about a kilometer away from the presidential palace where Prime Minister Enrico Letta and his ministers took the oath of office. GABRIEL BOUYS/AFP/Getty Images ( 519314262 )

Forensic police collect evidence where a shooting took place outside Chigi Palace, premier's office, in Rome, Sunday, April 28, 2013. Two Italian paramilitary policemen were shot and wounded Sunday in a crowded square outside the premier's office in Rome as Italy's new leader Enrico Letta was being sworn in at the Quirinal presidential office, about a kilometer (half-mile) away. It was not immediately clear if there was any connection between the shooting and the swearing-in. (AP Photo/Alessandra Tarantino) ( Italy Politics Shooting )

Forensic police collect evidence in Piazza Colonna Square where a shooting took place outside Chigi Palace, premier's office, building at left, in Rome, Sunday, April 28, 2013. Two Italian paramilitary policemen were shot and wounded Sunday in a crowded square outside the premier's office in Rome as Italy's new leader Enrico Letta was being sworn in at the Quirinal presidential office, about a kilometer (half-mile) away. It was not immediately clear if there was any connection between the shooting and the swearing-in. (AP Photo/Alessandra Tarantino) ( Italy Politics Shooting )