Authorities say two separate suicide bombings in Nigeria's northeast city of Maiduguri have killed at least three civilians and injured many soldiers.

Borno State governor Kashim Shettima said a crowded market in the heart of the city was attacked Thursday and engulfed in flames.

A senior security official, who spoke on condition of anonymity because he was not permitted to speak to the press, said there was a suicide bombing at the market. Witnesses said soldiers who stormed the scene of the blast set stalls on fire.

Shettima confirmed another suicide bombing in the city on Wednesday that killed three civilians and injured soldiers.

No group immediately claimed responsibility for the attacks, though Nigeria's predominantly Muslim north has been under attack by the radical Islamic sect known as Boko Haram.