Military authorities say hundreds of Islamic extremists have surrendered in Nigeria and neighboring Cameroon following the military's recent victories with air and ground attacks.

The Nigerian Defense Ministry also said it has killed hundreds of insurgents in the northeast including a man identified as having posed in videos as Boko Haram leader Abubakar Shekau.

The Nigerian army said it was victorious around Konduga town just 35 kilometers (22 miles) from Maiduguri, birthplace of Boko Haram and the headquarters of the military offensive to contain the Islamic uprising.

A Defense Ministry statement Wednesday said troops thwarted four attacks in six days on Konduga.

It said 135 insurgents surrendered Tuesday night.

Cameroon's defense ministry said more than 300 Boko Haram fighters have surrendered there this month.