Concrete ceiling pieces crashing to the ground force shutdown of Silver Line tunnel

State officials shut the Silver Line tunnel in the waterfront area today after "loose pieces of concrete" fell from the ceiling at the World Trade Center station onto the inbound platform. MassDOT blames "ongoing construction activity on Congress Street" right near the station.

MassDOT says Silver Line buses will now use already clogged surface roads to make their rounds.

The MBTA has ordered an engineering assessment to determine the extent of any structural damage that may have been caused by the adjacent construction project. Out of an abundance of caution for T customers and employees, the MBTA has closed the Silver Line tunnel from South Station to Silver Line Way until that assessment is complete. There were no known injuries as a result of this incident.