Bomb squads are investigating 'possible chemical reaction bombs'
Police were sent to several “suspicious bottles” along the MBTA Fitchburg line in Concord, Massachusetts.
Anti-bomb robots are believed to be examining a second device, local media claim.
Concord police, fire services and Massachusetts state police have all been deployed to investigate the bottles on tracks near Sudbury road.
Trains are being held at Concord due to police investigations. Customers have been told to expect severe delays.
Police have given trains permission to run though one track near Concord at reduced speeds.
More to follow...