British counter-terrorism police launched an investigation on Thursday after a suspicious item was found on a London underground train, saying they were keeping "an open mind" about the incident.

 

Police were called shortly after 6 a.m. ET after rail staff reported finding the item on a train at North Greenwich underground station, east of the Canary Wharf financial district and close to the O2 entertainment center.

 

A controlled explosion was carried out to make the item safe and the station remained closed, police said.