At least three inmates of a prison in Lagos are believed to have been killed in an electrical incident on Monday morning.

A member of staff told the BBC that the accident was caused by a power surge in Ikoyi prison.

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According to the source, after the surge, an electrical wire broke and fell on a bunk where inmates were sleeping.

Three inmates are believed to have been killed and a number of others are being treated in the hospital clinic.

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The authorities are still investigating the incident.