A drone has fallen from the sky while inspecting a cracked window on the Millennium tower in San Francisco.
A report by Fox News described how bystanders ran for cover as the drone and some of its debris began to fall from the sky.
The drone was inspecting a reported cracked window on floor 36 before it hit another building and began to plummet.
It is thought that the drone fell due to high rise buildings in the area preventing it from picking up communication signals.
The millennium tower has been the centre of controversy since 2015, when architects announced the building had started to slowly sink and tilt by around 18 inches.