Boko Haram is blamed for the attack today morning on the edge of the Islamic extremist group's Sambisa Forest stronghold, which Nigeria's military has been bombing ahead of ground assaults.
Since the military has dislodged the extremists from towns and villages this year, the insurgents have been attacking soft targets.
Survivor Ahmadu Gulak says the two explosions struck simultaneously at opposite ends of the market selling grains and vegetables.
An army spokesman, Maj. Badere Akintoye, says 30 people have died and 67 were wounded.
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