UPDATE: Fatal Crash Closes I-95 Northbound at Exit 21 in Port Chester

Update, 6:05 p.m.: Fox 5 News has reported that a 62 year-old woman was killed after her car was struck by a tire that fell off a tractor trailer onto her vehicle. Another woman in the passenger side of the car was taken for medical treatment.

Update, 4:55 p.m.: As police divert traffic off Exit 21 and to surrounding local roads, there are gridlock conditions on Purchase Street in Rye and Route 1 near the on- and off-ramps between Rye and Port Chester.

Original story:

Commuters heading back to Port Chester and traveling in neighboring communities this afternoon might want to find an alternate route.

All northbound traffic on I-95 has come to a standstill after a crash, according to state police at Troop T.

"We're suggesting people take alternate routes," said R.W. Groneman, a state police public information officer.

The crash was reported at mile marker 14.3, between exits 21 and 22. Police say they expect lanes to remain closed for several hours as they conduct an accident investigation.

The accident is also affecting traffic on the Cross Westchester Expressway.

Check back for updates.