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A screengrab taken on July 13, 2014 from a video released by extremist group Boko Haram and obtained by AFP shows the leader of the Nigerian Islamist extremist group Boko Haram, Abubakar Shekau (C). Image Credit: AFP/Getty Images

Abuja:  Nigeria’s air force said it had killed some senior Boko Haram militants and believed it had fatally wounded the group's leader in a raid on the group's northeast heartland.

Government planes attacked the fighters in the village of Taye inside the Sambisa forest in Borno State on Friday, the air force said, adding it had only just confirmed details of the raid.

"Their leader, so called 'Abubakar Shekau', is believed to be fatally wounded on his shoulders," the statement released on Tuesday from army spokesman Colonel Sani Kukasheka Usman added.

The military has reported Shekau's death in the past, only to have a man purporting to be him appear later, apparently unharmed, making video statements.

There was no immediate reaction from the group.