Los Angeles:`Iron Man` star Robert Downey Jr`s son has been arrested on suspicion of cocaine possession.

Indio Downey, who is son of Robert and his ex-wife Deborah Falconer, was detained by police on Sunday in West Hollywood, California, reportedly.

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.

He was arrested and taken to a local police station where he was booked on the drug charge. Indio was released in the early hours of Monday morning on USD 10,250 bail.

Indio`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.----- PTI