Baghdad, Iraq (CNN) -- Four civilians were killed and at least 17 people injured in a series of explosions in Baghdad on Sunday.
The first explosion was a sticky bomb attached to a minibus.
It went off near the ministry of transportation in eastern Baghdad, killing three passengers and injuring 11 others, police said.
Three more bombs exploded at a commercial district in central Baghdad, killing one civilian and wounding three others, police said. The improvised explosive devices exploded within a few minutes in three different locations.
In another attack, three officers were injured when a roadside bomb hit an Iraqi police patrol in eastern Baghdad.