Authorties in Nigeria say at least 11 people have been killed in violence blamed on Islamic insurgents in the country's northeast.

One attack happened Wednesday night in the fishing village of Gashua in Yobe state. Teacher Fati Umar, who witnessed the violence, said the Islamic extremists attacked a police station in the village and later a prison.

Lt. Eli Lazarus, a military spokesman, said the shootout killed two police officers and five civilians. However, Nigeria's military often downplays casualty figures to avoid the appearance that it is losing control of the region to extremists.

Another attack killed four in Bama, where a recent shootout between the military and extremists in Baga killed at least 187 people. In that attack, residents accused soldiers of killing civilians.