A fire in Footscray has caused extensive damage this morning, with fire crews still at the scene.

Believed to have started in a coolroom of the Little Saigon supermarket on Nicholson Street, the fire has spread to the Les Twentyman Foundation offices, which sits above the market and provides support to at-risk young people.

Fire crews were called to the scene just after 6am, with more than 60 firefighters battling the blaze through the morning.

Surrounding roads, including Nicholson Street, Ryan Street, Leeds Street, Donald Street and Byron Street have been closed. Smoke is still blowing in a southerly direction. The Metropolitan Fire Brigade has advised residents to close their doors, windows and vents, and turn to off cooling and heating systems.

The Little Saigon market opened in 1992 and was a popular shopping destination for the Vietnamese community and Footscray locals. It was made up of multiple businesses, including fresh fruit markets, fishmongers, restaurants and a bakery.

“In our office we would’ve had about 6000 school textbooks, probably a lot of Christmas presents,” founder Les Twentyman told the ABC this morning.