Hundreds of Nigerian troops are missing after Boko Haram jihadists overran a military base in the remote northeast, security sources said Sunday, in the second major assault on the armed forces in two days.

The militants invaded a base holding more than 700 soldiers in Yobe state — where they abducted over 100 girls from a school earlier this year — in an hours-long onslaught Saturday night, a military source told AFP on condition of anonymity. Fewer than 100 soldiers have returned following the attack, which took place just 24 hours after Boko Haram fighters ambushed a military convoy in neighbouring Borno state on Friday. The two assaults have highlighted the tenuous hold Nigerian forces have on the ravaged region despite claims by President Muhammadu Buhari’s government that the country is in a “post-conflict stabilisation phase”.

A leader of a local anti-jihadist militia said the soldiers sustained casualties, but was unable to give a toll, attributing the attack to the Abu-Mus’ab Al-Barnawi faction of Boko Haram, which is known for targeting Nigerian forces.

Nigerian army spokesman Texas Chukwu said he did not know about the attack. “I am not aware of the attack because (I) have not received information from there,” Chukwu said in a text message to AFP.

•Excerpted from a Vanguard report