Bodies of the children in their school uniforms were brought to the local morgue, according to a hospital official who insisted on anonymity because he was not authorized to release the information to journalists.
Yesterday's attack at Ansarudeen Private School in Maiduguri marked the second time in days that suspected radical fighters have attacked schools.
The military reported that 13 people, including high school students and teachers, were killed on Sunday night during a five-hour shootout when extremists attacked a boarding school in Damaturu, the state capital of Yobe state.
The student spoke on condition of anonymity for fear of reprisals. Military spokesman Lt Eli Lazarus said seven students, two teachers, two soldiers and two militants were killed in the attack and that three soldiers were critically injured.
He said several militants also were captured. In another attack yesterday, suspected extremists gunned down a group of fisherman on a river bank in Alau, located 20 kilometers outside Maiduguri.