Nigeria’s national health minister confirmed that a Liberian man who died in a Nigerian megacity on Friday tested positive for Ebola, an often fatal virus that has killed nearly 700 people in the largest outbreak on record.

Reuters reported that the man collapsed at the Lagos, Nigeria, airport on Sunday and was taken to the hospital, where he was put in quarantine. He died five days later.

Onyebuchi Chukwu, Nigeria’s national health minister, said at a press conference that the diagnosis had been confirmed by the Lagos teaching hospital and by “other laboratories outside Nigeria.” The state health minister and the World Health Organization, however, both said they were awaiting laboratory confirmations, Reuters reported.