Two drones collided mid-air on Saturday and crashed onto the 96th floor of the Shanghai World Finance Center while apparently attempting to pass through the wind tunnel at the top of the landmark skyscraper, according to local media.

One of the fallen drones was later found on the 433-meter high roof with its wing axis piercing a hole in the waterproof layer. Video footage of the collision went viral online.

According to Lu Liangjun, director of the management and operations department at the Shanghai World Finance Center, a total of 95 drone accidents have been recorded within the building's restricted area since October 2016.

These accidents have led to damage ranging from broken glass to holes in the building's waterproof structure.

Lu said that most of the accidents were caused by unauthorized and illegal flights. Even though many of those responsible have since faced punishment, this has not stopped drone-flight enthusiasts. So far this year, 17 accidents have been recorded at the building.

In Shanghai, drone flights are subject to registration requirements, with their flight altitude generally restricted to 120 meters outside of prohibited areas.

Currently, the core area of Lujiazui, known for its dense cluster of high-rise buildings, is classified as a warning zone for drone flights.

The management of the center has called for enhancement of the drone-flight registration system, enabling real-time monitoring of flights through technical means.

"Given the frequent safety risks, the core area of Lujiazui should be formally designated as a prohibited area for drone flight," Lu added.

Cui Chuandong contributed to the story.