Nigeria’s military on Saturday acknowledged a major attack against it by Islamic extremists after opposition lawmakers said 44 soldiers were killed, while public pressure on President Muhammadu Buhari grew over the failure of his pledge to defeat Boko Haram.

The military statement issued overnight didn’t say how many are dead after the Nov. 18 attack in Metele in the northeast, but it dismissed media reports citing even higher tolls and called the situation under control. Nigeria is often reluctant to expose the number of casualties after such attacks.

However, information gleaned from military sources said the casualty of military personnel had risen above 100 earlier reported. This besides the civilians killed by Boko Haram in the deadly attack on military bases.

“We are concerned about death of military personnel, nobody is talking about the death of unarmed civilians who must have been gunned down by the extremists on their way to attack the military and after the attack”, a military source said.

As Buhari faces growing pressure over insecurity ahead of next year’s presidential election, an aide said the president had summoned military chiefs and sent the defense minister to neighboring Chad for an “urgent meeting” with President Idriss Deby. A multinational force combating Boko Haram is based in Chad.

Nigeria’s leader is “worried by Boko Haram’s renewed attacks on military bases,” aide Bashir Ahmad said in a post on Twitter.

The Islamic State West Africa Province, the largest IS-linked extremist group in Africa and a recent offshoot of Boko Haram, claimed responsibility for Sunday’s attack, according to the SITE Intelligence Group that monitors extremist messaging. The group last month caused outrage by killing an abducted health worker despite an urgent plea from the International Committee of the Red Cross to spare her life.

Nigerians are increasingly concerned about reports of growing casualties among troops fighting extremists.

Buhari, who made the defeat of the Nigeria-based Boko Haram a major goal of his presidency when he was elected in 2015, “is preoccupied with re-election campaigns” while many homes are filled with mourners, human rights activist Okechukwu Nwanguma said in a statement on Saturday.

The government under Buhari, a former military dictator from the north, has claimed in the past that Boko Haram has been “crushed,” but the extremists continue to carry out deadly suicide bombings and abductions in the northeast and wider Lake Chad region.

In an interview with The Associated Press last month, Nigeria’s information minister Lai Mohammed said that “today not a single inch of our territory is occupied by Boko Haram” and that peace had largely returned to the northeast.

Additional reports by Associated Press