Hundreds of students are feared missing after shooters raided a secondary school in north-western Nigeria.
The attackers arrived on motorbikes and started shooting into the air, causing people to flee, witnesses said.
They targeted the Government Science Secondary School – where more than 800 students are said to reside – in Katsina state on Friday evening.
On Saturday, the military said it had located the gunmen’s hideout in a forest and exchanged gunfire with them.
The outcome was unclear, but officials said there were no reports of students being injured.
Meanwhile, Nigerian President Muhammadu Buhari condemned the attack and ordered the school to complete a full audit of students to find out how many are missing. Parents who dashed to the school to take their children home were also asked to notify the school authorities.
Residents living near the all-boys boarding school in the Kankara area told the Tropics Nigeria News they heard gunfire at about 23:00 (22:00 GMT) on Friday and that the attack lasted for more than an hour.
Security personnel at the school managed to repel some of the attackers before police reinforcements arrived, officials said.
In a statement Saturday, police said some of the gunmen were forced to retreat during an exchange of fire. Students were able to scale the fence of the school and run to safety, they said.
About 200 students who had fled – and were initially deemed missing – later returned. However, witnesses said they saw several students being taken away by the gunmen.