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By F. Brinley Bruton and Camilla Schick

A daredevil teen has apologized after he was filmed jumping off an iconic London bridge into the Thames River and had to be rescued by emergency services.

A screenshot of Shah Faisal Shinwari before he jumps from the Tower BridgeShah Faisal Shinwari via YouTube

"Here is an unedited version of me jumping off London's famous Tower Bridge into the River Thames," 17-year-old Shah Faisal Shinwari, who goes by "Carnage," says in a YouTube video posted Thursday. "This was later very regretted by me and I realized it was the stupidest idea ever. Thanks for watching!"

The video shows him leaping off Tower Bridge and into the brackish and fast-moving waters. He is then seen lying on a dock, spitting up and receiving first aid.

The stunt was swiftly condemned by London police and the Royal National Lifeboat Institution (RNLI).

"We are extremely disappointed that this young man chose to risk his life in this way. He was very lucky that the outcome wasn't more serious," RNLI spokesman Tony Wafer told NBC News. "We are glad that this young man regrets his actions, however we would strongly discourage anyone from doing anything like this."

Jumping into the Thames from a bridge is very dangerous because the shock of the cold water can make it very difficult to swim and the strong currents can also sweep people away, Wafer added.

For his stunt-gone-wrong, Shinwari promised to donate any money earned from ads on the video to the RNLI.