Three GTA movie theaters have been forced to evacuate hundreds of people after a noxious odour has made numerous patrons feel nauseous on Friday.

Peel police said they received a call for Cineplex Cinemas Mississauga around 7:20 p.m. for a chemical vapour and a similar call for the SilverCity Brampton Cinemas at 7:25 p.m. and Toronto police confirm that someone set off pepper spray at a Scarborough theatre.

At this time crews are on scene with the Hazardous Materials team investigating ^pb — Brampton Fire (@BramptonFireES) April 22, 2016

Paramedics said they were treating three people on scene at the Mississauga theatre and one person was transported to hospital from the Brampton movie theatre.

Brampton fire said the cause of the odour was from pepper spray but it is not clear at this time if that is the same for the other two theatres.

HazMat crews are currently monitoring air quality. The building has been evacuated ^pb pic.twitter.com/6G55mEFKjs — Brampton Fire (@BramptonFireES) April 23, 2016

“Theatre 12, which was showing a Tamil version of Jungle Book, was evacuated just before the movie began,” said CityNews viewer Mark Ressor who was watching a movie at Scarborough Town Centre.

Ressor said people were coughing as they were leaving the theatre.

“There was some sort of acid smell which also made me cough and my nose run,” said Ressor.

Paramedics said no one has been transported to hospital from the Scarborough movie theatre. Toronto police confirm that 200 people were evacuated and the odour was contained to a single theatre.

Emergency crews are on scene at both locations in Mississauga and Brampton trying to determine the cause is.