World Bulletin / News Desk
The bombers targeted crowded parts of Muna Gari suburb.
The two female and two male bombers, who are suspected to be members of Boko Haram, killed themselves and 14 others, police spokesman Victor Isuku said.
"A total of 18 people, including the four suicide bombers, died in the multiple explosions," he said.
The first explosion occurred at a prayer ground, while the other explosions occurred at different locations in the community, he said.
He said the 29 injured in the blasts have been taken to public hospitals in the city.
No group has claimed responsibility, but police blame Boko Haram militants for the attacks and previous bombings in the area.
The militant group, which is seeking to carve out a territory for itself in northeast Nigeria, has carried out nearly seven years of attacks in the region.