(CNN)A grenade exploded in a camp for internally displaced people (IDP) killing 15 and wounding five in an attack on Sunday morning, a a local official told CNN.
The incident happened in Nguetchewe village in Cameroon's far north region, near the country's border with Nigeria, and was carried out by suspected Boko Haram militants, the official said.
The militants crossed from neighboring Nigeria around midnight and stormed an IDP camp, throwing a grenade in a group, killing 13 people instantly, according to Medjeweh Boukar, the town's mayor.
"13 persons died on the spot and two died in the hospital and my convoy is now taking the bodies to the village," Boukar told CNN after the incident.
Boukar said Cameroon's soldiers are investigating the attack.
The ambush is the second this year in the region after about seven persons were killed in suicide bombings in April.
Boko Haram, originally from Nigeria, has been mounting attacks in Cameroon, Chad and Niger.
The jihadist organization and its splinter group, the ISIS-aligned Islamic State West African Province (ISWAP), have caused violence and destruction in Nigeria's northeast and the surrounding Sahel region over the last decade.
The government of Nigeria declared Boko Haram a terrorist organization in 2013, and several months later, the US State Department followed suit.
A CFR security tracker estimates that more than 37,000 people have been killed, and millions have been displaced in the conflict in Nigeria between 2011 and 2018.