05/21/2014 08:59 EDT | Updated 07/21/2014 05:59 EDT

1 dead, 3 injured after 9-vehicle crash on Hwy 401

One person is dead and three others are injured following a nine-vehicle crash in west Toronto Tuesday, according to police.

The collision happened at around 4:30 p.m. Tuesday on Highway 401, west of Yonge Street in Etobicoke when — for unknown reasons — the driver of a loaded dump truck lost control of his vehicle and hit several other cars before rolling over.

The male driver of another vehicle was killed and three people were treated for minor injuries in hospital.

That portion of the highway remained closed until 2 a.m. Wednesday.

The crash is under investigation.