Niger and Chad attacked Boko Haram militants on Monday on islands on Lake Chad that the Islamists have used as a safe haven, military sources in Niger said.
A push by Nigeria's armed forces and troops from neighboring Chad and Niger has driven Boko Haram from most of the positions it controlled earlier this year, reversing militant gains that forced Nigeria to delay a February election.
"The islands are not easy to access but we have located the enemy positions. The air forces are bombing them right now," a Niger soldier based in regional capital Diffa told Reuters.