At least 7 football fans electrocuted watching TV in Calabar
Local media said up to 30 fans were feared dead in the incident.
The incident happened in the southern port city of Calabar on Thursday during a quarter-final between Manchester United and Anderlecht being shown on satellite television, the police said.
"We received a report of the incident around 10:00 pm and on getting there were able to recover the bodies of seven people who had been electrocuted when a high tension cable fell on them," Cross River state police spokeswoman Irene Ugbo told AFP.
"Eleven other fans who were injured were rushed to the hospital, with one in a critical condition," she said.
Ugbo ruled out any foul play in the tragedy.