UPDATE, June 14, 2019: Burnaby RCMP have released the 62-year-old man who was arrested. No charges have been laid.

EARLIER:

A 33-year-old man who was hit by a bus in Burnaby, B.C., on Tuesday has life-threatening injuries, RCMP say.

Officers said the man had been arguing with another man before, somehow, he "entered the roadway" on Hastings Street near Carleton Avenue during rush hour. The bus hit him in the lane closest to the sidewalk around 5:45 p.m. PT.

Two men were arrested at the scene. One of them, a 62-year-old man, remains in custody. No charges have been laid.

"How the male entered the roadway is still under investigation, with a focus on whether it was a result of the altercation," RCMP said in a statement released Wednesday.

Officers are still trying to figure out whether the men knew each other.

Burnaby RCMP said two people were arrested in relation to the incident. Both have since been released. (Gian-Paolo Mendoza/CBC)

The bus driver is not under investigation.

Mounties blocked off two eastbound lanes of Hastings Street for hours as part of the investigation. RCMP remained on scene Wednesday, with a large blue tarp covering the hood of the TransLink bus.

Investigators were at the scene for several hours after the crash Tuesday evening. (Gian-Paolo Mendoza/CBC)

Members of the serious crime unit have also been assigned to the case.

RCMP said anyone who witnessed the incident or who may have dashcam or surveillance video should contact police at 604-646-9999, or Crime Stoppers to remain anonymous.