A teenage student was flattened by a runaway tire after it came loose from a truck and bounced along a street in Santiago, the capital of Chile.

Surveillance footage from October 29 shows the 19-year-old walking beside a road when the tire comes out of nowhere and knocks him down.

It had come loose from a truck as it drove through a nearby underpass. Eyewitnesses who helped the victim said he was suffering an injury to his arm, was bleeding and suffering from dizzy spells after the immediate impact.