Boko Haram attack kills at least 26 in Cameroon
The unnamed official described the attack as one of Cameroon's bloodiest in recent months.
"Seventeen soldiers and nine civilians" were killed in the attack early Monday on Darak, a Cameroonian island located near Lake Chad, the regional security official told AFP.
A preliminary count, given on Monday, had three Cameroonian soldiers killed along with an unspecified number of civilians in an attack on a military post in the area.
The official told AFP on Tuesday that the Boko Haram attack sparked fierce combat with Cameroonian troops. He said 40 of the fighters were captured and seven soldiers remained missing.
Before being repelled, the militants managed to hoist their flag over Darak, several security sources said.
Boko Haram's decade-long uprising to establish a hardline Islamic state in Nigeria's northeast, which has killed more than 27,000 people and left 1.8 million homeless, has spilled into neighbouring Niger, Chad and Cameroon.
An anti-Boko Haram force combining soldiers from Chad, Cameroon, Niger, and Nigeria has been set up but has failed to rout the group from the restive Lake Chad region.