Residents in Nigeria say suspected Islamic militants have opened fire on police and civilians in a northeastern town, killing at least 11 people.
Witnesses say gunmen attacked the town of Damboa in Borno state on Thursday night, firing at people and burning homes.
Earlier in the week, suspected Islamic militants attacked a mosque and surrounding homes in another town, Konduga in Borno state, killing at least 47 people.
There has been no claim of responsibility for the attacks, but officials suspect the radical Islamist group Boko Haram is behind the violence.
Boko Haram has claimed responsibility for previous attacks in northeastern Nigeria, including some on mosques where clerics have denounced religious extremism.
The group says it is fighting to impose a strict form of Sharia on Nigeria's Muslim-majority north. It been blamed for thousands of deaths since launching an uprising against the government in 2009.
Borno is one of three northeastern states where President Goodluck Jonathan declared a state of emergency and deployed additional troops in May to fight Boko Haram. Rights groups have criticized the military for heavy-handed operations they say have led to hundreds more deaths.