Man arrested over WA party death

A man has been arrested in connection with a death at an out-of-control party in suburban Perth.

Police arrested the 23-year-old on Saturday night, less than 24-hours after a man died at a house party in Atwell.

Police were called to the Atwell home, in the city's south, after reports of an out of control party around 1.30am (WST) Saturday where they found a 20-year-old man with serious injuries.

He was raced to Fremantle Hospital where he died hours later.

Two other men, a 21-year-old and a 22-year-old were taken to Royal Perth Hospital and Fremantle hospital respectively with non-life threatening injuries.

Police are now questioning the 23-year-old man over the death.