Denver police are investigating what led to a single vehicle crash resulting in the death of two people on Sunday morning.

Police first received a report of the crash at 3:57 a.m. along the southbound Interstate 225 exit to Interstate 25. Officers arrived to find a car involved in a single vehicle rollover crash, according to a Denver Police Department spokesperson.

Two people were pronounced dead on-scene, according to police.

It is unclear what led to the vehicle crashing.

Police said southbound I-25 is closed until further notice.

The crash remains under investigation.