Nigerian army rescued 180 people in the early hours of Friday, but around 30 male and female students remain unaccounted for after gunmen attacked a forestry college in northwestern Kaduna state overnight.
Around 30 students have been reported missing after gunmen attacked a forestry college near a military academy in the northwest Nigerian state of Kaduna, the fourth mass school abduction since December.
Kaduna state's security commissioner Samuel Aruwan, said in a statement on Friday, that an armed gang attacked the Federal College of Forestry Mechanization at around 1030 GMT (11:30 pm local) on Thursday.
He said the Nigerian army rescued 180 people in the early hours of Friday but "about 30 students, a mix of males and females, are yet to be accounted for."
The Federal College of Forestry Mechanization sits on the outskirts of Kaduna city, capital of Kaduna state, in a region roamed by armed gangs, who often travel on motorcycles.
Local resident Haruna Salisu, speaking by phone, said he had heard sporadic gunshots at around 1030 GMT (11:30 pm local time).
"We were not panicking, thinking that it was a normal military exercise being conducted at the Nigerian Defence Academy," he said.
"We came out for dawn prayers, at 1620 GMT (5:20 am local), and saw some of the students, teachers and security personnel all over the school premises. They told us that gunmen raided the school and abducted some of the students."
Salisu said he had seen military personnel taking the remaining students into the academy.
On Friday morning, relatives of students gathered at the gates of the college, which was surrounded by around 20 army trucks.
Banditry has festered for years in northwest Nigeria, rendering large swathes of the region lawless.
The trend of abduction from boarding schools was started by the militant group Boko Haram, which seized 270 schoolgirls from a school at Chibok in the northeast in 2014, around 100 of whom have never been found.
It has since been taken up by armed criminal gangs seeking ransom.
Within the last few weeks, 279 schoolgirls were freed after being abducted from their boarding school at Jangebe in northwest Nigeria's Zamfara state, and 27 teenage boys were released after being kidnapped from their school in the north-central state of Niger, along with three staff and 12 family members.
One student was shot dead in that attack.
Military and police attempts to tackle the gangs have had little success, while many worry that state authorities are making the situation worse by letting kidnappers go unpunished, paying them off or, as in Zamfara, giving them amenities.
In late February, the presidency said President Muhammadu Buhari had urged state governments to "review their policy of rewarding bandits with money and vehicles, warning that the policy might boomerang disastrously."
The unrest has become a political problem for Buhari, a retired general and former military ruler who has faced mounting criticism over the rise in violent crime, and replaced his long-standing military chiefs in February.
READ MORE: Nigeria's mass kidnappings: A timeline