ESTILL -- Authorities say nine inmates at a federal prison in Hampton County were taken to the hospital after a fight in the prison's recreation yard.

Federal officials said in a press release that the disturbance happened about 8 p.m. Thursday at the prison in Estill.

Authorities said the prison has been on lockdown after the fight, and there was no danger to the public.

Officials said seven inmates have been released from the hospital and brought back to the prison.

The FBI is investigating what prompted the fight and how many inmates were involved.