Witnesses in Nigeria say gunmen attacked a police station in the northern part of the country late Monday, killing several police officers.

The gunmen, suspected members of the radical Boko Haram Islamic group, also attacked a nearby bank in the town of Kankara in the far northern state of Katsina.

Several days ago, Boko Haram claimed responsibility for a suicide bombing outside Nigeria's national police headquarters in Abuja, killing at least one other person.

The group is blamed for a string of deadly attacks in Nigeria's north that have targeted police officers, government officials and other authority figures.

Several people were wounded in the blast last Thursday, and police say more than 30 cars were destroyed.

Separately, a bomb went off in Nigeria's northeastern Borno state Thursday, killing three children.

Boko Haram is believed to have carried out many bombings and shootings in Borno state. The group is pushing to impose strict Islamic law across the north.

Boko Haram launched a brief uprising against the government in July 2009, sparking a heavy military response and a week of fighting that killed some 700 people.