Reported explosion and stampede at London subway station

LONDON — London police and ambulances descended upon a subway station Friday after a reported explosion on a train standing at the platform, and a witness said commuters stampeded down the stairs to escape.
A commuter whose train was stopped at Parsons Green station says there was panic after a woman saw what appeared to be an explosion. A photo taken at the scene showed what appeared to be a burning pail inside a train. The commuter, Richard Aylmer-Hall, said he saw several people injured