London's Jubilee underground line reopens after incident

London's Jubilee underground train line reopened on Friday after an investigation of a reported incident raised no security issues, London's transport authority said.A spokeswoman for London's transport authority said police had investigated and found no threat to the public.A Reuters reporter at Waterloo station said travellers exiting the eastbound Jubilee line ran out of the carriages when the train stopped at the station saying they had heard three loud bangs while on the train.