Official reports says that an unknown number of militants have been killed during air raids on their training camps up north.
Spokesman for the army said jets and helicopter gunships were used to attack several camps.
Some of the camps hit by air raids were in the Sambisa Game Reserve, about 70km (45 miles) south of the Borno state capital, Maiduguri, where the militants first emerged in 2009, said Nigerian military spokesman Brig Gen Chris Olukolade.
“a plane was hit by anti-aircraft fire but had managed to returned to base”
“A number of insurgents have been killed. It is not just Sambisa, every camp is under attack. But we have not done the mopping-up operations on the ground to determine the numbers killed”.