Four youths have been arrested after fleeing a crash in Christchurch.

A police spokesperson said they responded to a three-vehicle crash on Sparks Road, near Lyttelton Street at 10:40am.

Four youths were located and arrested after they fled on foot.

All four will be referred to Youth Aid, the police spokesperson said.

A St John spokesman said they sent an ambulance to the scene.

One patient was assessed by the crew and transported to Christchurch Hospital in a moderate condition.