Melbourne factory fire now under control

A fire at a car parts factory in Melbourne's north is under control, after the blaze forced the evacuation of six people.

The blaze broke out in the 30-by-30 metre Campbellfield factory shortly before 9am on Thursday, the Metropolitan Fire Brigade said.

Six people were evacuated from the Malcolm Place building and the blaze was brought under control within about 45 minutes with ariel appliances before it could spread to adjoining factories.

A worker at a nearby business said the fire had started at a car wreckers.

An advice message has been issued for Campbellfield, Lalor and Thomastown but there is no threat to the community.

Ambulance Victoria said they were at the scene but no one was injured.

Smoke was drifting south from the fire and people were urged to avoid the area.

Residents sensitive to smoke have been told to stay inside, shut their doors and windows and turn off heating or cooling.

The cause of the blaze will be investigated.