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Suicide bombers killed 15 civilians in an attack on a state oil company facility in northeast Nigeria, the country’s military said on Wednesday.

Soldiers at a facility checkpoint opened fire on explosive-laden vehicles before the bombers were able to enter the Nigeria National Petroleum Corporation facility at Mule.

Seventeen civilians and five soldiers were also wounded, Defense Ministry spokesman Chris Olukolade said.

Four bombers were killed in the attack.

There was no immediate claim of responsibility, though the perpetrators are believed to be from militant group Boko Haram.

Mule is situated just outside Maiduguri, the capital of the Borno, a well known hotbed of the Islamist insurgency.

“Three of the four explosive-laden vehicles were demobilized by shots fired at them by soldiers at the checkpoint, shortly before the explosions that rocked the area,” Olukolade said. “A total of 15 civilians including a member of a youth vigilante group died,” he said.