Peel Region police are searching for two men who were caught on camera walking into a Mississauga restaurant last night before an explosion.
The 'improvised explosive device' injured 15 people at the Bombay Bhel restaurant. Paramedics took three people to a trauma centre in Toronto, but they have since been upgraded to stable condition.
Both suspects wore dark hoodies and covered their faces.
Police describe one suspect as a man in his mid 20s, around 5'10" with a stocky build, and light skin. At the time he was wearing dark blue jeans, a dark zip up hoodie pulled over his head, and a baseball cap with a light grey peak.
The second suspect is described as around 5'9" - 5'10", fair skinned, with a thin build. At the time he was wearing faded blue jeans, a dark zip up hoodie pulled over his head, a grey t-shirt, and dark coloured skate shoes.
A possible motive has not been released at this time.