A trio of suicide bombers killed 19 people at a fish market in the northeast Nigerian city of Maiduguri, capital of the state worst hit by the Boko Haram insurgency, its police commissioner said on Saturday. Nobody has claimed responsibility for the attack but the use of suicide bombers in crowded areas is a hallmark of the militant group, which has killed more that 20,000 people since 2009 and forced over two million to flee their homes. Damian Chukwu, police commissioner for Borno state, said the attack took place at the market around 20 kilometers from the center of Maiduguri at about 8:00 p.m. Friday. "The three suicide bombers were killed and 18 other persons died. Twenty-two people were injured," said Chukwu. Babakura Kolo and Musa Ari, from the Civilian Joint Task Force (CJTF) assisting Nigerias military against the militants, said the bombers were all men. "We have 19 dead and about 70 others injured... Two of the bombers attacked the Tashan Kifi fish market. Then four minutes later, a third bomber struck nearby," said Kolo. "The victims included 18 civilians and one soldier. The Tashan Kifi is an informal market which serves as an eatery, market and also hang-out for residents."