A Manchester United football fan in south-eastern Nigeria drove a minibus into a crowd of Barcelona supporters, killing four people, police say.
Ten other people were wounded in the incident in Ogbo town, after United lost Wednesday's European Champions League Final 2-0 to the Spanish team.
A police spokeswoman told Reuters news agency: "The driver passed the crowd, then made a U-turn and ran into them."
He is now in police custody. Both teams have a large fan base in Nigeria.
"The man confessed to doing it on purpose," police spokeswoman Rita Inoma Abbey told the BBC.
"He now says he doesn't know why he did it, but it was an intentional act."
Football fans across Africa closely follow the European leagues, which recruit some of the continent's best players.
Earlier this month, a Kenyan Arsenal fan hanged himself after his team's defeat in Champions League semi-final second leg by Manchester United.