NEW YORK (CBS) Mel Gibson isn't the only one facing possible criminal charges.
Los Angeles authorities are checking into extortion allegations against Gibson's ex-girlfriend, Russian singer Oksana Grigorieva.
Sheriff's spokesman Steve Whitmore says the agency is looking into whether Grigorieva may have tried to extort the Academy Award-winner. He declined to offer any other details on the inquiry.
Detectives earlier this month interviewed Grigorieva after she claimed Gibson abused her during an incident in January.
A spokesman for Grigorieva declined comment Wednesday.
Gibson and Grigorieva are locked in a bitter custody dispute over their infant daughter.
No arrests have been made, and neither has been charged with any crimes.