Thirty-five children have been killed in a crush at a funfair in the south-west Nigerian city of Ibadan, with six others hospitalised, the police say.

The event was advertised as free entry and drew a large crowd but so many people turned up that there was a crush as they struggled to gain entry.

Residents said that over 5,000 children had gathered at the venue and the crush occurred when the main organisers arrived to start the event.

The sequence of events leading to the crush has not been disclosed.