After nine people were injured in a four-vehicle wreck in Denison Saturday, three people are still recovering in the hospital.

Denison Police are continuing the investigation into the wreck, and Lt. Mike Eppler said Tuesday the cause is not yet known for why a vehicle entered a highway lane of incoming traffic. At about 11:20 a.m. Saturday, a Buick sedan traveling northbound on U.S. Highway 75 left the roadway, crossed the median and struck a southbound SUV near Loy Lake Road.

The SUV then struck a third vehicle, a van, which caused it to veer off the roadway and onto the service road on the west side of the highway. The van then came into contact with a fourth vehicle driven by Denison City Manager Jud Rex, Eppler said. Rex told the Herald Democrat on Saturday that his vehicle received only minor damage and was still operable.

The nine people injured, including an infant, were transported to the hospital for injuries related to the crash. Eppler said Tuesday the male and female occupants of the Buick were still in the intensive care unit at the hospital. Eppler said the male passenger received broken bones, and the female driver had injuries to her face that required surgery.

The infant was transported to a Dallas area hospital, and Eppler said the child was well. The infant’s mother is still recovering in the hospital, and Eppler said she underwent surgery. The rest of the injured were released from the hospital.

A helicopter was called to the scene at the time of the accident, but it wasn’t able to respond due to weather conditions, Eppler said. Sherman and Denison EMS did respond to transport the injured.

Highway 75 was closed for about an hour as crews worked the scene, he said.