A cyclist on the the Stanley Park causeway died instantly Saturday evening after she fell off the sidewalk and was hit by a transit bus.

The incident happened shortly before 7 p.m. PT on Saturday. Vancouver police spokesman Const. Brian Montague says the woman may have fallen off the curb after hitting a pedestrian on the sidewalk.

"Our investigators have talked to some witnesses. That's the initial belief, that as the cyclist was coming down the sidewalk, she did collide with some pedestrians that were also on the sidewalk, and that's possibly what caused her to fall into traffic," said Montague.

Montague said the sidewalk on the causeway is shared and that cyclists must yield to pedestrians.

The VPD is asking any witnesses who were on the bus to contact them. Police are also reviewing footage from a video camera mounted on the bus.

The female cyclist has not yet been identified.

The Lions Gate Bridge was closed after the incident, but reopened just after 11 p.m.