Six workers overcome by fumes after unknown chemical spill near Melbourne Airport

Six people have been overcome by fumes after a chemical spill near Melbourne Airport this morning.

Fire crews from the Metropolitan Fire Service and Melbourne Airport were called to a freight storage property on Mace Way at around 2am this morning after the unidentified substance spilled.

The six workers were treated on scene and one was taken to hospital for observation.

The MFB declared the incident under control an hour later, but said it would take some time to clean up the spill once the substance has been identified.

The incident has not affected flights and is not believed to be suspicious.