Gunmen on Wednesday attacked the National Institute of Construction Technology in Uromi, Edo state.
The assailants were said to have shot sporadically in the air to scare away residents and passersby before abducting a lecturer and two students of the institution.
The students were said to be writing their second semester examinations at the time of the attack.
Confirming the incident, Bello Kontongs, spokesperson of the state police command, said the attack happened in the evening.
He assured that the police were on the trail of the attackers and would apprehend them.
In December, gunmen had kidnapped Anthony Okungbowa, the head of service in the state, killing his driver in the process.
In January, Bridget Esene, spokesperson of the Nigeria Immigration Service (NIS), Edo Command, was kidnapped by gunmen while on her way to church in Benin, the state capital.
There have been series of kidnappings across states, which has heightened the level of insecurity in the country.