June 26 (UPI) -- Seven suicide bombers killed nine people and injured 13 others in four attacks in the northeastern Nigerian city of Maiduguri, police said Monday.
The bombings occurred at the University of Maiduguri, which is the capital of Borno state, and in the Jere area of the city on Sunday night and Monday morning, state Commissioner of Police Damien Chukwu said at press briefing. All of the male and female attackers also died.
A male suicide bomber killed a female security guard at the entrance to the University of Maiduguri's Rapid Response Services Office at 10:20 p.m. Two other security personnel were injured, the police commissioner said.
One hour later, four female suicide bombers killed eight people and injured 11 others in Jere by detonating devices in residential buildings.
Around 4:20 a.m., two female suicide bombers were the only people to die in two blasts at the university's Center for Entrepreneurship and Enterprise Development and the Students Industrial Work Experience Scheme. The injured were transported to hospitals.
No group has claimed responsibility for the blasts in Maiduguri but Boko Haram often uses women to detonate bombs in the region.
The university first came under attack by Boko Haram on Jan. 16, when five people died, including a renowned professor of veterinary medicine and two suicide bombers. One explosion occurred at a staff mosque and the second was at an entrance gate on the university premises.
The university, which is on the outskirts of the city, was built in 1975 and has 25,000 students.