At least four people were taken to hospital after an unknown substance was thrown through the window of a home Monday night.
Two occupants of the home on Taseko Crescent, just southeast of Westminster Highway and No. 2 Road, fell ill and the two Mounties who attended the scene around 11 p.m. were also affected.
On Tuesday morning, Richmond RCMP were still trying to identify the substance and the motive and the home in question, a detached single-family house, was sealed off.
At the time of the incident, fire and HAZMAT crews cleared the surrounding area, but no other homes were affected.
