A small plane flew into Beijing's Citic Tower on Friday—the city's tallest building—and dramatic video shared on social media shows debris plummeting dozens of stories onto streets where pedestrians fled to avoid being hit by falling glass and other rubble.

The plane appears to be a Sunward SA 60L Aurora owned by a local aviation company, according to CNN , a light-sport aircraft that holds only two people.

Information posted online by Flightradar24, which has not been verified, suggests the plane had significantly deviated from its planned flight path.

It’s unclear how many people were injured in the crash, and to what extent, and the New York Times reported social media posts about the incident are being censored in China.

Also known as China Zun, the 109-story skyscraper is the headquarters of Citic Group, a state-owned financial conglomerate.

Who, or where, the pilot is. Information on who was flying the plane, or who else may have been onboard, hasn’t been made available.

Ian Petchenik, a spokesman for FlightRadar, told the Times the plane that crashed into the building “is normally used for pilot training east of Beijing” and that Friday’s flight was “out of character,” adding, “I don’t think we can rule anything out at this point.”

The Civil Aviation Administration of China enforces some of the strictest security measures in the world in Beijing's airspace. Commercial flights often have to take long, indirect detours to avoid central Beijing, and drones have been effectively prohibited in the city for months. It’s virtually impossible for private pilots to casually fly into Beijing without prior authorization and, unlike in the U.S. or Europe, pilots cannot file a spontaneous flight plan without explicit state approval. Much of the airspace surrounding the capital city is entirely off-limits to recreational single-engine planes and pilots who do get permits are required to follow exact, pre-approved flight corridors.