A sociology student, a sexology student and a geography student from the University of Quebec at Montreal have been indentified as suspects in yesterday's smoke bomb attacks in the Metro system.

La Presse this morning says the trio, two women and a man , are among four people that Montreal police have identified as suspects.

They were recognized by arson squad investigators who had viewed security camera video.

The newspaper says they are all members of a more radical faction of the Classe student union , which is already considered the most militant of the three student unions involved in the tuition protests.

It is not known if they have met with police investigators.

Police are still looking for a fourth male suspect.

You can see their images here.

Photo credit: Chris Brooker