Twelve Iraqi security forces were killed and 23 others injured in suicide attacks against army and police posts in northern Baghdad on Tuesday, a security source said. The source, from Baghdad's Operations Command, told KUNA eight soldiers were killed and 14 injured when two suicide bombers blew themselves up at Brigade 22nd in the Tarmiya district. Another suicide bomber detonated the explosives around his waist at a police station in Taji district killing four policemen and wounding nine others, added the source. The spate of violence have been remarkably increasing killing at least 750 people this month only