Chadian aircraft have struck Boko Haram positions in the Nigerian border town of Gamboru for a second straight day, witnesses in a neighbouring town said.
Two military helicopters pounded targets in Gamboru for about two hours on Sunday, setting off loud explosions and sending thick clouds of smoke into the sky, an AFP journalist said from the town of Fotokol, about 500 metres away.
The town in northeastern Nigeria, on the border with Cameroon, was already strafed by two Chadian fighter jets on Saturday, when the air strikes began.

http://www.aljazeera.com/news/2015/02/chad-forces-launch-fierce-assault-boko-haram-150203071007658.html
http://www.bbc.com/news/world-africa-30623199

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Viewing the widening field of Boko Haram activity a direct threat to its national interests, Chad has deployed its war-tested army to join the fight against the extremists, and has reportedly now entered Nigeria in at least two places.

N'Djamena has not yet officially confirmed its troop movement into Niger, but it is now thought Chad may be positioning its forces to be able to trap Boko Haram in pincer offensives launched simultaneously from the north and south.

In Gamboru, the offensive, which was preceded by days of Chadian air strikes, had left scenes of desolation, with bodies lying on the ground, houses destroyed, shops gutted and trucks charred.

"We have routed this band of terrorists," the commander of the Chadian contingent Ahmat Dari told AFP Tuesday, vowing to "hunt them down everywhere."


http://www.abc.net.au/news/2015-02-05/boko-haram-goes-on-rampage-after-chad-troops-offensive/6071312