Interstate 84 West is closed in Southington due to a car rollover crash, according to the CT Department of Transportation.
The westbound side of the highway is closed in the area of exit 31. I-84 East is also closed in the area of exit 28, but has reopened.
Connecticut State Police said serious injuries were reported. Drivers are being asked to take alternate routes.
Traffic in the area was backed up for several miles. It is not known when the highway will reopen.
The crash was reported around 4:30 p.m. DOT officials were called to assist with traffic.
The state police accident reconstruction team is investigating. No additional information was immediately available.