The Metropolitan Fire Brigade has updated their ‘watch and act’ warning.

Earlier in the day residents of Campbellfield, Broadmeadows, Pascoe Vale and Coburg were told to immediately find shelter and stay indoors. 

The same alert has now been extended to Coolaroo, Dallas and Somerton.

Those residents should shut all doors, windows and vents, and turn off all heating and cooling systems.

The toxic plumes are spreading southwest and 175 firefighters are trying to get the blaze under control. 

It’s expected to last for days. 

KIIS 1011 Melbourne