Chad Troops Have Entered Nigeria To Join The Battle Against Boko Haram
Armoured vehicles and infantry crossed a bridge from Cameroon following air strikes and mortar attacks on Boko Haram positions, officials say.
Fighting focused on the key north-eastern town of Gamboru, Nigerian security spokesman Mike Omeri said.
Chad’s deepening involvement shows how the conflict with Boko Haram is taking a regional dimension.
Last week, Chadian troops reportedly moved into Malumfatori, a Nigerian town which lies near the borders of Chad and Niger, after a ground and air assault against the militants.
Chadian forces have also massed near the town of Diffa in Niger, Reuters news agency quotes military sources in Niger as saying.
Boko Haram leader Abubakar Shekau has threatened to create a caliphate, incorporating parts of Nigeria, Niger, Chad and Cameroon.
The African Union has responded by backing plans to establish a 7,500-strong regional force to fight the group.
The Chadian contingent of about 2,000 troops crossed the frontier without a shot being fired, AFP news agency reports from the scene.