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

Dramatic footage from Beijing posted on social media showed debris falling from the 109-story CITIC Tower, also known as China Zun, as well as a tail section of the plane and a broken window of a taxicab on the ground.

A CNN journalist witnessed people evacuated from the skyscraper gathering on the streets near the entrance, along with firetrucks, police cars and an ambulance.