A suspicious "device" believed to be a jerry can with what appears to be a gas bottle attached, has been found near an outer Melbourne police station and courthouse but police have declared the area safe.

The Victoria Police Bomb Response Unit attended the street in Frankston, where the station and Magistrates Court is located.

A dirty brown paper bag seen resting up against the wall of the Frankston Law Courts, was believed to contain a red jerry can, attached to what appears to be a blue gas bottle.

Police cordoned off the area and sent in two robotic devices to remove any danger.

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The police bomb response unit attended to do safety checks but the area was declared safe and reopened to the public.

- AAP