-- Suicide bombers attacked a police station, a military base and a hospital Sunday in and around the northern city of Mosul, according to police, killing at least 26 people.

In Baghdad, the U.S. military reported that a homemade explosive device killed one American soldier and slightly wounded two others. No further details of the incident were available.

The first attack in Mosul occurred near dawn at police headquarters in the center of the city, 220 miles north of Baghdad. A suicide bomber drove a red pickup truck loaded with explosives into the building, killing at least six people, wounding nine and destroying an entire section of the structure, police officers and witnesses said.

According to the Associated Press, witnesses said the pickup truck was allowed to pass through a checkpoint because it was carrying watermelons. "We didn't suspect him. Everyday we see such cars because we're near a market," one police officer, Mohammed Hussein Ali, 30, told the AP.

Police Gen. Saeed Mohammed said he expected the final death toll to be higher because many were trapped in the rubble. The Reuters news agency quoted a U.S. military spokesman as saying that as many as 15 people may have been killed.

A short time later, at an Iraqi military base 50 miles west of Mosul, a suicide car bomb at an entrance gate killed 15 Iraqis and wounded 13. The victims were civilians who worked on the base, Mohammed said.

Sunday afternoon, a man wearing an explosives belt walked into a police post in Mosul's main hospital and detonated his charge. The blast killed five police officers and wounded eight others, police Gen. Wathiq Muhammed Tahir said.

In Kirkuk, 150 miles north of Baghdad, several roadside bombs, a suicide car bomber and an explosive device strapped to a dog wounded at least seven people, but killing was limited to the suicide driver and the dog, according to police.

Brwari reported from Mosul. Special correspondent Marwan Ani in Kirkuk contributed to this report.

A masked police officer navigates past the wreckage of a suicide car bombing at police headquarters in the northern city of Mosul that killed six officers.