ABUJA -- At least 14 people were killed in an attack by suspected terrorists who attacked a community in Borno, one of the restive states in Nigeria's northern region, local authorities said Tuesday.

The terrorists, suspected to be members of the outlawed Boko Haram group, stormed the Chibok community during a third-day prayer for a late district leader Monday evening, shooting indiscriminately and instantly killing seven mourners, Modu Mustapha, head of the Chibok local government area of Borno, told reporters.

Seven more bodies were recovered Tuesday as local volunteers combed the surroundings in search of casualties. Many others sustained varying degrees of gunshot injuries during the violence, which, according to Mustapha, had the trappings of Boko Haram attacks. Several houses were set ablaze during the attack.

The local government official said more casualties might be recovered, as volunteers continue to search for more bodies.

Boko Haram has been collaborating with its sister group, Islamic State West Africa Province, in an attemp to establish an Islamist state in northeast Nigeria. The terror groups have also extended their attacks to other countries in the Lake Chad Basin.