08/13/2017 10:49 EDT | Updated 08/13/2017 11:00 EDT

Four people seriously injured in tour bus accident in Vancouver

VANCOUVER — Four people were injured in an accident today involving a tour bus in Vancouver.

B.C. Emergency Health Services say two people are in critical condition while another two are listed in serious condition in hospital.

It's not yet clear how the accident happened.

Images from the scene in downtown Vancouver show a bus that appears to have hit a vehicle.