The Montreal police arson squad is investigating a second suspicious fire in the Plateau district in as many days.

Police were called to a car wash on Iberville St. near Rachel around 2:30 a.m. Wednesday after witnesses reported hearing an explosion.

Officers noticed the flames and called firefighters who quickly intervened.

Damages were limited and there were no injuries.

Traces of a flammable material were later found at the scene.

Police say it's too early to determine whether there is a link with a suspicious fire that left 20 people homeless in the neighbourhood on Tuesday morning.