Two truck bombs struck separate communities north of Iraq's capital on Saturday, killing at least 16 people, Iraqi authorities said.
The bombings were the latest in a series of attacks in northern Iraq, indicating insurgents are targeting relatively unprotected areas as Iraqi security forces focus on tightening security in the cities.
The Iraqi government is eager to demonstrate it can protect the population following the withdrawal of US combat troops from urban areas nearly two months ago.
But a recent series of high-profile bombings that have killed hundreds in both major cities and remote areas has raised concerns Iraqi forces are not up to the task.
Today's deadliest attack came at about 8 am when a suicide truck bomber attacked a small police station in the remote village of Hamad, killing at least 12 people, including six police, said officials from the Iraqi army and police.
Police at a checkpoint attempted to stop the truck, forcing the attacker to change direction and slam into a concrete barrier close to an open air market, they said.
Twelve people were also wounded, said the police official.
Hamad is a primarily Sunni village between Saddam Hussein's hometown of Tikrit and Mosul, which the US military considers to be the last urban stronghold of al-Qaeda in Iraq.
The second attack today occurred near Mosul in the city of Sinjar, where a parked truck bomb that exploded at about 10:15 a m killed at least four people and wounded 23 others, another police official said.