Suicide bombers staged a series of attacks Friday in northeastern Nigeria, killing four of themselves and two civilian defense fighters, police said.
In the early morning, police challenged two women and a man running toward a checkpoint opposite the Federal High Court in Maiduguri, said Victor Isuku, a police spokesman for the northeastern state of Borno. One woman set off her device, killing herself and the male accomplice, he said; while the other woman survived and was being questioned.
Authorities also say two other suicide bombers blew themselves up at a bus and taxi station on the outskirts of the city, killing themselves and the two civilian fighters.
This marked the fifth attack in three weeks on the city that is the birthplace of Nigeria's homegrown Islamic extremist group, Boko Haram.
Northeastern Nigeria has been the epicenter of a seven-year Boko Haram insurgency.
Boko Haram has stepped up attacks recently, after a months-long pause in their Islamic uprising that has killed more than 20,000 people.
Nigerian security forces have managed to foil most of the attacks.