Nigeria's Islamic extremist rebels Boko Haram renewed their threat to use violence to disrupt Nigeria's upcoming elections.

In a video published by the SITE Intelligence Group, Boko Haram leader Abubakar Shekau reiterated the insurgents' warnings that they will use violence to disturb the elections, scheduled for March 28.

Shekau also claimed responsibility for the attack on Saturday on the town of Gombe in northeastern Nigeria. The Nigerian army and two fighter jets repelled the Boko Haram attackers. As they retreated from Gombe, the Boko Haram fighters scattered papers warning residents not to vote in the elections because polling stations would be attacked.

The warnings come as leaders from countries neighboring Nigeria finalized plans for a joint offensive against Boko Haram who have stepped up their attacks in recent weeks.