Boko Haram pledged allegiance to the Islamic State last February, and changed its name to the Islamic State in West Africa.

“Lake Chad suicide attack ‘kills 27,'” AFP, December 5, 2015 (thanks to Thomas):

N’Djamena (AFP) – At least 27 people were killed and more than 80 wounded Saturday in a triple suicide bombing on an island in Lake Chad, a security source said in the capital N’Djamena.

“Three suicide bombers blew themselves up in three different places at the weekly market on Loulou Fou, an island in Lake Chad,” the source told AFP, speaking on condition of anonymity.

He said the explosions had “killed 30 people”, including the attackers, and wounded more than 80.

N’Djamena on November 9 declared a state of emergency in the flashpoint Lake Chad region, which also straddles Nigeria, Cameroon and Niger and is frequently targeted by Boko Haram Islamists who this year declared allegiance to the Islamic State.

The decree granted the governor of the remote region the authority to ban the circulation of people and vehicles, to search homes and to seize arms.

In recent months, Boko Haram Islamists have stepped up attacks and suicide bombings on Chadian villages in the lake that lie close to the frontier with Nigeria….