PHOENIX - A man and a woman were taken to a local hospital with serious injuries after they were hit by a vehicle making a left turn near 43rd and Maryland avenues Sunday night.

Police said the riders' injuries are life-threatening. Neither rider was wearing a helmet, police said.

The driver of the turning vehicle remained on scene and is cooperating with investigators.

Authorities have closed 43rd Avenue between Bethany Home Road and Maryland Avenue for the investigation.