Updated at 12:25 p.m. Friday with more details from sheriff's deputies.

Dallas County sheriff's deputies are looking for a truck driver who left the scene of a crash that seriously injured two women Sunday in the Stemmons Corridor.

The crash occurred around 6:45 p.m. in the northbound lanes of Interstate 35E near Dallas North Tollway, deputies said.

It is unclear how many vehicles were involved, but a four-door Honda was trapped under an 18-wheeler when the rig changed lanes, officials said. The 18-wheeler continued north without stopping, leaving both women riding in the Honda with serious injuries, officials said.

Nearly a week later, authorities are still searching for the driver, and the 21-year-old women are still in the hospital.

Cassandra Lizardi remains in critical condition, while Kaylee Jensen is stable, sheriff's spokesman Raul Reyna said.

The two students at the University of Texas at Dallas are roommates and were on their way to dinner when the crash occurred, Reyna said.

The 18-wheeler is described as an orange tractor/cab and a white trailer. No evidence from the rig was found at the scene, deputies said.

Anyone with information should contact the Dallas County Sheriff's Department at 214-589-2335 or 214-589-2323.