In Baghdad, a car bomb exploded outside the heavily fortified police academy, police and witnesses said. Minutes later, a suicide attacker blew himself up as police rushed to respond to the blast.
Sixteen people were killed and 45 were wounded, police said.
Bloodied police uniforms and a military boot left by victims were scattered with the crumpled metal hulk of the car bomb on the charred street in the aftermath of the bombing, according to Associated Press Television News footage.
The attacker apparently was a teenage boy whose head was taken to a local hospital, a police officer said. An AP photographer saw the head and confirmed it appeared to be a teenage boy.
Those killed included five policemen and 11 recruits, while the 46 wounded included 11 policemen and 35 recruits, according to police and hospital officials who spoke on condition of anonymity because they weren't authorized to release the information.
The U.S. military initially said the death toll appeared to be about 20 but later said reports indicated six people were killed and 20 wounded.
In Mosul, a suicide attacker apparently targeting a U.S.-Iraqi patrol in the western part of the city killed 15 people, a police officer and an official at the morgue said.
The officials spoke on condition of anonymity because they weren't authorized to release the information.
The U.S. military says initial reports show two Iraqi National Police and seven civilians were killed in Monday's attack. It says one U.S. soldier and 39 Iraqi civilians were wounded.
Conflicting tolls are common as authorities struggle to rescue victims in the chaotic aftermath of bombings.
