Two people are thought to be behind the bombing of an Indian restaurant outside Toronto on Thursday night that wounded 15 people, three of them critically, officials said.

The blast happened around 10:30 p.m. at the Bombay Bhel restaurant in Mississauga, Ontario, a sprawling city just west of Toronto. Sgt. Matt Bertram of the Peel Regional Police said the assailants had entered the restaurant and put down what appeared to be a pail or a paint can, which then detonated as the two fled down the street.

Rafael Concaceicao, a student from São Paulo, Brazil, told the Canadian Broadcasting Corporation that he was on the patio of a nearby restaurant when he heard the explosion at Bombay Bhel. He rushed to help, he said.

Read more: New York Times