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The short statement on WeChat did not identify the building or the pilot, who the authorities said was the only person on the craft.

The global flight tracking service provider Flightradar24 on Friday said the plane crashed into the CITIC Tower, also known as China Zun, which rises more than 1,700 feet (528 meters), just east of a major ring road in a cluster of skyscrapers.

The 108-story CITIC tower, shaped like an ancient wine vessel, is one of the most recognizable skyscrapers in Beijing and is the tallest building in the city.

Flightradar24 posted the flight path of the plane, a Sunward SA 60L Aurora, which took off from an airport about 50 kilometers (30 miles) east of Beijing, on social media. It headed westward and ended just east of the East Third Ring Road.

On Saturday, photos by The Associated Press showed apparent marks of the crash on the glass facade on one side of the CITIC Tower. A hole there had been covered up.

It was not immediately known what caused the crash in a city with strict airspace controls, including a on drones. An investigation is underway into the situation, the authorities said.

It was unclear whether the injured were in the building or were hit by debris, but the statement said they were receiving treatment.

Social media posts about the crash were scrubbed from China’s walled-off internet on Friday, though footage has made its way outside of China’s firewall and is circulating on overseas sites such as . Incidents such as crashes are considered sensitive by Chinese authorities.

Images and videos shared on social media appeared to show debris from a small aircraft near the skyscraper. While the images were consistent with the location, it was not possible to independently confirm their authenticity. One image of the wreckage shows a partial registration number of “B-12.” The full registration number of the aircraft is B-12PP.

According to Flightradar24, the aircraft was operated by Shuangyue General Aviation, in an apparent reference to Dongshi Shuangyue (Beijing) General Aviation, whose website was not accessible on Saturday. The firm provides services ranging from private pilot training to aerial sightseeing tours, said an online platform citing official data.

SA 60L is a product of Starair Aircraft, based in China's central Hunan province. According to Starair's website, the single-engine aircraft accounts for more than 70% of China’s light sports aircraft market and has been exported to Australia and the United States.

Its maximum cruise speed is 220 kilometers (137 miles) per hour and its maximum take-off weight is 600 kilograms (1,322 pounds), the website said.