A small aircraft appeared to have struck the tallest building in the Chinese capital Beijing on Friday afternoon, in a shocking incident in one of the most fortified cities in the world.

Beijing's airspace is regulated by some of the strictest security measures in the world.

Beijing's airspace is regulated by some of the strictest security measures in the world.

A startling incident unfolded in Beijing as a small aircraft seemingly collided with the city's tallest skyscraper, the CITIC Tower. Social media footage showed debris falling and…