An explosion and fire on a London Underground train caused panic and injuries during rush hour Friday morning. Police, ambulances, and firefighters were called to the Parsons Green station in the southwest of the city after the blast, which authorities are now calling a terrorist attack, the Guardian reports. Photos and video shared on social media showed a fire in a bucket but no extensive damage to the subway car. Passenger Richard Aylmer-Hall says he saw several people injured in a stampede to escape the packed train. "Suddenly there was panic, lots of people shouting, screaming, lots of screaming," he says.
Passenger Peter Crowley tells the BBC that he was sitting on the train when he felt a "really hot intense fireball above my head." He adds: "There were people a lot worse than me." Other witnesses say they saw at least one person being taken away with burn injuries. The London Ambulance Service says at least 18 people were hospitalized after the attack, none of them with life-threatening injuries, the AP reports. London Mayor Sadiq Khan urged Londoners to remain vigilant and said the city "utterly condemns the hideous individuals who attempt to use terror to harm us and destroy our way of life." (Read more London Underground stories.)