Police are investigating after an odd incident resulted in the evacuation of a Melbourne tram.
About 60 people were on-board the tram at the Bourke St Mall at 2.20pm on Friday when an unidentified woman entered, spraying an “unknown substance” before leaving.
The tram was evacuated at the next stop as firefighters boarded before determining the substance was not harmful.
Witnesses of the emergency response said passengers on board were coughing and crying, leading to speculation the aerosol was pepper spray.
“When I turned back the door was closing and someone was spraying,” Jackie He told 7NEWS.
“They were saying it was capsicum spray, and it felt spicy, and everyone started coughing.”
A Victoria Police spokeswoman said an infant and her 31-year-old mother were assessed at the scene but did not go to hospital.
“It is believed an unidentified woman entered the tram on Bourke Street, before spraying the unknown substance from an aerosol can into the air,” she said.
“The circumstances surrounding the incident are yet to be determined and an investigation remains ongoing.
“Anyone with information or CCTV footage is urged to contact Crime Stoppers.”
Crime Stoppers can be reached on 1800 333 000 or online at www.crimestoppersvic.com.au.