Nigeria’s military said on Friday that a suicide bomber has detonated inside a mosque in Borno State, killing six worshippers and himself.

Colonel Sani Kukasheka Usman, spokesperson for the Nigerian Army said in a statement that two bombers first tried to enter the bigger Damboa Central Mosque early Friday but were kept from entering by armed soldiers acting as mosque security.

He said one bomber detonated and killed only himself near the Damboa Central Mosque, but the other bomber entered a smaller mosque and killed six with his blast.

Damboa is 70 kilometers from Maiduguri, the capital of  Borno state.

Such blasts are often blamed on Boko Haram Islamic extremists who have killed hundreds this year in the region.