Chinese Weibo user @Charlie_7U became an online sensation last week after shooting a hair-raising video atop Zifeng Building in the city of Nanjing, east China's Jiangsu Province.

The video, shot using a selfie stick, shows him sitting on rails atop the skyscraper with no safety harness, along with other daredevils.

Photo via @Charlie_7U Weibo account

Netizens were taken aback by the courage of the urban explorer. However, after his story went viral, local police warned that the four young men might have violated public safety rules.

The Paper contacted the man who shot the video, identified as 23-year-old Tong Hu, who is a worker from southwest China's Chongqing Municipality.

“We did not have any protective gear,” said Tong. “The building manager did not know we were scaling it. We went straight away as the door to the top was open, luckily.”

Photo via @Charlie_7U Weibo account

Tong started urban exploration a year ago, as he was bedazzled by the astonishing shots taken by other rooftoppers overseas. All buildings, over 200 meters high in Chongqing have been scaled by Tong.

Photo via @Charlie_7U Weibo account

“But if their activity leads to crowding by onlookers or set off alarms, they can be detained for violating social order,” Zuo Yingchun, a legal practitioner in Beijing, told The Paper.