By Jay Gormley, CBS 11 News

DALLAS (CBSDFW.COM) – A seven-car pile-up near downtown Dallas sent seven people to the hospital and shut down Interstate-30 in both directions for nearly five hours on Thursday. Two of the seven injured people are in serious, but stable condition. There were no fatalities.

The seven vehicles involved included two 18-wheelers, a cement truck and four passenger vehicles.

According to witnesses, one of the 18-wheelers was heading west on Interstate-30 when it plowed into the back of the cement truck, at around 1:00 p.m. Thursday afternoon near Sylvan Avenue. The cement truck was then pushed into the other 18-wheeler.

The cement truck then continued through the center guard rail and ended up in the eastbound lanes of the highway. The four passenger cars were either pinned or crushed by the larger trucks.

The cement truck driver received only minor injuries and stayed on the scene to speak with investigators.

Hazmat crews scrambled to keep spilled diesel fuel from running into the Trinity River below. Jason Evans with Dallas Fire-Rescue said that the fuel came within five feet of polluting the river.

Interstate-30 was closed for much of the Thursday afternoon rush hour, but reopened later on Thursday afternoon.