Boko Haram Leader in New Video Denies Reports of His Death

Boko Haram leader Abubakar Shekau appears in a new video denying Nigerian military reports that he was fatally wounded and taunting parents of the kidnapped Chibok schoolgirls that they will only see their daughters again if the government swaps them for detained Islamic extremist leaders.

Shekau warns the people of Chibok that "you have not seen the worst yet," and laughs maniacally. Nearly 300 girls were kidnapped from a government school in Chibok in April 2014 and 217 remain missing.

Nigeria's military, meanwhile, reports at least four soldiers were killed and 16 wounded when extremist fighters on Sunday exploded a land mine and ambushed a convoy near the northeastern town of Bama, where the governor of Borno state has set up temporary headquarters to encourage refugees to return home.