Dozens of firefighters have battled a suspicious early morning blaze at the former Jam Factory entertainment complex, which is being redeveloped.

Police said the fire started in a construction site near the intersection of Chapel and Garden streets in South Yarra about 1.40am on Friday.

A fire truck at the former Jam Factory entertainment complex on Friday morning. Credit: Alex Coppel

Several people called triple zero after seeing smoke billowing from the building.

“No one was on site during the incident. The cause of the blaze is yet to be determined,” police said.

Flames lick the inside of the former Jam Factory site. Credit: Nine News

Fire Rescue Victoria said the cause of the fire was suspicious. A crime scene has been established and emergency service crews are investiga

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