Surrey buses
© Ric Ernst, PNGTransit users cue to board a Coast Mountain bus at the Surrey Central Exchange, one station in the Translink infrastructure in Surrey, B.C. Thursday March 12, 2015.
Transit Police are investigating after four people riding a bus in Surrey fell ill. Surrey RCMP said they received a report of a possible hazardous substance on a bus just before noon on Sunday.

The bus was at 96th Avenue and King George Blvd. when four passengers told the driver they "were not feeling well."

"Preliminary witness accounts suggested that the patrons on the bus may have been exposed to an unknown substance," said the press release. "However, subsequent checks by the Surrey Fire Department and investigating agencies found no evidence of any hazardous materials.The patrons were treated and released at scene."

Reports indicated an unknown powder was left on the bus that may have caused some passengers to cough.