BAGHDAD - Iraq on Sunday executed 42 Sunni Muslim militants convicted on terrorism charges ranging from killing members of security forces to detonating car bombs.The biggest mass execution this year in Iraq came after the government came after Sunni suicide attacks killed at least 60 people near the southern city of Nassiriya, a Shi'ite area, on Sept. 14, prompting Shi'ite demands for tougher judicial action.The Justice Ministry said the 42 had been hanged at a prison in Nassiriya, three months after 14 other militants were executed following convictions for terrorism.Islamic State claimed responsibility for three suicide attacks targeting restaurants and a security checkpoint near Nassiriya. Relatives of victims were invited to witness Sunday's executions, the justice ministry said.