Four Nigerian students have died after attending a party in the south-eastern town of Nsukka to celebrate the end of their final exams.
The cause of death has not been confirmed but police spokesman Daniel Ndukwe said the two men and two women had reportedly fallen ill after consuming alcoholic drinks at the party.
The University of Nigeria Nsukka has declared three days of mourning, during which academic and social activities will be suspended.
The tragedy comes amid a wider crackdown on fake and adulterated alcoholic drinks in Nigeria, where the food and drug regulator has been raiding suspected producers of unsafe food and beverages.
The university's Vice-Chancellor, Professor Simon Ortuanya, said the university had received a distress call at 22:00 on Wednesday, and sent security personnel to a house party at Praise Lodge, outside the campus in Nsukka's Hilltop area.
"The preliminary investigation and interim report point to alleged alcohol abuse or drug paraphernalia and things like that. But we are not conclusive on those matters," he said.
He described the deaths as "tragic and painful".
"As a community, we mourn, not just alone, we mourn with the families, the parents that have suffered these years to train the men and women in their studies," he said.
