WESTPORT - One person was killed Wednesday in a crash involving a tractor-trailer and at least one car in Westport, state police say.

The crash happened around 6 p.m. on the southbound side of I-95 near Exit 17.

News 12 is told the tractor-trailer was carrying sewage at the time of the crash at the end of the Saugatuck River Bridge.

Witnesses say it appeared that the truck went off the highway and down an embankment near Underhill Parkway.

As of Wednesday night, all southbound lanes on I-95 between exits 17 and 18 were closed. There were several detours in the area.

State police said they expected lanes to reopen after midnight Wednesday.