Two male suspects fled the scene immediately after the explosion in the city.

Peel Regional Police said they had received a call about the incident at 22:32 local time (02:32 GMT).

End of Twitter post by @PeelPoliceMedia

Police issued CCTV footage of the two suspects, describing them both as men around 5ft 10 in height with light or fair skin, and appealing for help identifying them.

One man was described as "stocky" and in his mid-20s, while the other was of thin build. Both wore blue jeans and dark hoodies, and had covered their faces.

3 injured critically 

http://www.bbc.com/news/world-us-canada-44248453