Two of those attacks happened in Sadr City and one was in the al-Hurriya neighborhood, police officials said.

CNN: 4 killed, 11 wounded in twin bomb blasts in Baghdad

The blast in Hurriya, a predominantly Shiite neighborhood in northwestern Baghdad, was one of the deadliest to hit the Iraqi capital in months.

CNN: Car bomb kills at least 51 Iraqis, official says

In September 2012, the US government removed the PMOI from the state department's list of designated terrorist organisations, in part because of its co-operation in the move to Camp Hurriya.

BBC: Deadly rocket attack on Iranian exile camp in Iraq