One person was killed in a crash involving a pedestrian and a tractor-trailer.
Three of the four northbound lanes of Interstate 95 in Groton remain closed as state police investigate the crash on Thursday morning.
Officials from the state Department of Transportation said the crash, between exits 83 and 85, was reported at about 4:45 a.m.
The three left lanes are closed and traffic is backing up.
No other information is available.