National Grid is installing new gas pipes near the corner of Hicks and Montague streets, which has caused Montague to be closed between Henry and Hicks.
Update: The National Grid crew finished the job quickly, and the block is now re-opened to traffic (though the block of Montague between Clinton and Court will be closed from 7:00 p.m. to 11:00 p.m. this evening; see below).