Over 200 students of a secondary school attacked by unidentified gunmen in Nigeria's northern state of Katsina have returned, local police said on Saturday.

Most of the students jumped over the school fence into the bush and other locations nearby to hide as the gunmen attacked, said Gambo Isah, the state police spokesperson, in an interview with Xinhua via telephone.

Isah said some "bandits" attacked on Friday night the Government Boys Science Secondary School which is located on the outskirts of Kankara town of the state.

Earlier reports indicated that some students might have been abducted during the attack which lasted about an hour.

Isah said the police and school authorities were working together to find out the exact number of students that have not returned.

"So, this morning the Divisional Police Officer found over 200 of the students and returned them back to the school," he said.

"We are still counting the figures in order to ascertain whether or not actually the bandits were able to kidnap any of the students," said Isah.

According to the police spokesperson, no student was killed during the Friday night attack, noting that the gunmen in their numbers attacked the school with dangerous weapons.

He added that the gunmen shot at one of the security guards at the gate who is presently under treatment.