Steven Seagal is being investigated over an allegation of sexual assault said to have taken place in 2005, the Los Angeles Police Department has said.

The action movie actor has faced further allegations under the increased scrutiny on Hollywood since the Harvey Weinstein scandal broke, reports the Press Association.

On Friday a spokeswoman for the police force said a complaint is being handled by the Robbery-Homicide Division but offered no more information.

"All we can do is confirm that there's an open investigation from 2005," she said, adding it is an allegation of sexual assault.