Robert Downey, Jr.'s son has been arrested on suspicion of cocaine possession.

Indio Downey, whose mother is the Hollywood star's ex-wife Deborah Falconer, was detained by police in West Hollywood, California on Sunday afternoon (29Jun14).

The 20 year old was a passenger in a car which was pulled over by police, and he was allegedly found in possession of the drug following a search, according to Tmz.com.

He was arrested and taken to a local police station where he was booked on the drug charge. Downey was released in the early hours of Monday morning (30Jun14) on $10,250 (£6,406) bail.

Downey's movie star father spent years battling drug problems after finding fame in Hollywood in the 1980s. He later turned his life around and made a successful career comeback.