Suspicious fire in a Preston unit has forced the evacuation of 30 residents.

Several calls to the Eric St address were made just before 10 last night to a 1st-floor unit.

It was under control about half-an-hour later and two people were treated on-scene by paramedics.

The Age described the apartment block as “asbestos-riddled” and the 30 residents had to find alternative accommodation.

The cause of the fire is not yet known.