UPDATE, 4:19 p.m. The Blue Line has resumed service through Maverick and Maverick Square has been re-opened to traffic.
Maverick Square is shut down as Transit and Boston Police investigate a double shooting inside the Blue Line station around 2:30 p.m.
One witness reports it happened on a train.
Buses are running instead of the Blue Line between Bowdoin and Airport. Congress Street downtown was shut between State and Washington due to congestion caused by all the buses.