A car drives past the building with an excavator on top in Shanghai, Feb 6, 2015. [Photo/IC]

An excavator was seen on the rooftop of a 15-storey building in Shanghai on Friday, seemingly determined to tear down the building from the top.

The building, located at Shanghai's Miaopu road, used to be an office block. The excavator, which weighs about 20 tons, was lifted onto the high-rise by crane, according to the security personnel at the site.

However, construction workers said the heavy machinery will soon be carried down to the ground as the building was found to be unable to support its weight.

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An excavator is seen on the top of the 15-story building in Shanghai, Feb 6, 2015. [Photo/IC]