Aftermath footage of the roof of a double-decker tour bus ripped off by height restriction barriers.

The video, shot in Zhengzhou City in central China's Henan Province on October 21, shows passengers standing on the upper deck of the bus after the roof got ripped off.

Police officers and medical workers can be seen helping tourists get off the bus and sending injured people to hospital.

Four people were injured and the bus driver was controlled by police.