Story highlights Attack occurs at the College of Administrative and Business Studies in Potiskum

Students and residents chase one of the attackers as he continues firing at them; he blows himself up

Kano, Nigeria (CNN) A gunman wearing a suicide bomb vest attacked a school in northeast Nigeria's Yobe state Friday morning, leaving 12 people seriously injured and the attacker dead, according to a police source and students who witnessed the attack.

The man opened fire on students as they underwent security checks outside the College of Administrative and Business Studies (CABS) in Potiskum at 8:10 a.m. local time, and rushed into the school firing sporadic shots while being chased by students and residents, a witness said.

"We have evacuated 12 people with serious gunshot wounds to hospital from the scene of the shooting attack," a police officer said on condition of anonymity because he was not authorized to speak about the incident. A paramedic at the Potiskum General Hospital said the hospital received 12 people with serious injuries.

"The gunman died after he set off his suicide explosives as he was being chased inside the school, but no one was hurt," the officer said.

Two accomplices fled the scene, and the Nigeria Police Force said on Twitter that they "have now been arrested at different locations after coordinated pursuit."

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