BAUCHI, Nigeria?- Two female suicide bombers blew themselves up Tuesday in a crowded market in Nigeria's northeastern city of Maiduguri, killing at least 30 people, said witnesses and a security official.

The two teenage girls dressed in full hijab entered the busy market and detonated their explosives, said Abba Aji Kalli, the Borno state coordinator of the Civilian Joint Task Force.

The first set off her explosives and killed about three women, said Kalli.

When others gathered around the scene, the second bomber screamed and blew herself up, killing about 30, he said.

"I am right here at the scene and I have before me 11 corpses ... many have been taken away by relatives, while others are taken to the state specialists' hospital," said Kalli.

Soldiers and police officers cordoned off the area while rescue workers helped survivors to the hospital.

Nigeria's Islamic extremist rebel group, Boko Haram, are suspected of the suicide blasts, as they have carried out many similar violent acts in northeastern Nigeria.

Today's blast is the first in Maiduguri since July 2 when 56 people were killed in the same market area when a car bomb hit a group of traders and shoppers.

Nigeria's police have not yet issued a statement on Tuesday's blasts.