Three Burlington firefighters are in hospital with heat related illness after battling an industrial fire.
Firefighters were called to the Nalco Canada Headquarters on Truman Street last evening.
It's a water treatment service provider.
Fire officials say flames were coming out of the roof when they arrived and the heavy smoke could be seen from the QEW.
Burlington Fire says the likely source of the 100 thousand dollar fire is a tar pot from roof repairs.