LAGOS, Nigeria (AP) — Gunmen have released some of the children kidnapped from a school in northern Nigeria back in May, some of whom were as young as 5 years old, the school's head teacher said late Thursday.

Abubakar Garba Alhassan told The Associated Press that the freed students were on their way to the state capital, Minna, but added he could not confirm the exact number freed.

Authorities have said that 136 children were abducted along with several teachers when gunmen on motorcycles attacked the Salihu Tanko Islamic School in Niger state.