Witnesses told CBC News that by 5:30 p.m. PT, several people appeared to have been taken into custody.
Langley RCMP only said that it was on the scene of a "criminal incident" in North Langley that began at around 4 p.m. PT.
RCMP spokeswoman Cpl. Holly Marks said few details were available.
"As the investigation is in its infancy, very few details are available while investigators determine exactly what has transpired," she said.
"Additional information will be provided as it becomes available in an effort to protect the integrity of the investigation."