The new Italian government was sworn in at the presidential Quirinale Palace in Rome, reported the BBC.
The new government is being called the "grand coalition" with Democratic Party Deputy Leader (PD), Enrico Letta, as prime minister including Silvio Berlusconi's People of Freedom party (PDL), reported the BBC.
Politicians were the supposed targets of the gunman, reported the Associated Press.
Italy has been in a "political deadlock" since February's inconclusive election, reported the AP.
Rome Prosecutor Pierfilippo Laviani said the the "'desperate" gunman had `'lost work, had lost everything." He said the man "wanted to shoot politicians, but given that he couldn't reach any, he shot the Carabinieri" police at the edge of Chigi Square," reported the AP.
A man by the name of Luigi Preiti has been arrested and has confessed to targeting politicians, reported the BBC.