(KUNA) -- A bomb exploded on Wednesday killing seven guards of industrial sites in Babel Governorate to the south of Baghdad, police said. The US Army said in a statement 64 militants were arrested in two combat operations on November 21, one at the restive Lutufiyah village, where 45 gunmen where arrested and the other one in Al-Anbar Province, north of Fallujah, where 13 militants were apprehended. Six other suspects were arrested close to Al-Habbaniyah village near Fallujah.Separately, Iraqi government forces arrested a leader of a shadowy group, active against the state, called "Omar's Army," southwest of Baghdad.