HOUSTON- A series of accidents caused the Southwest Freeway to shut down for hours early Sunday morning.

According to the Houston Police Department, a car with two males inside lost control for unknown reasons and slammed into the middle barrel divider where U.S. 59 and I-610 split around 1:30 a.m.

Police said the car bounced off and side swiped another car. The two men in the car had to be rescued and were taken to the hospital in serious condition. No one was hurt in the other car.

A couple of hours later, while HPD was blocking the entrance ramp to prevent cars from entering near the crash area, a male slammed into the back end of the HPD unit around 3:30 a.m. No one was hurt, and the driver in this instance was tested for a possible DWI.

Thirty minutes later, another person slammed into the back end of another HPD unit that was blocking the main lanes of the freeway.

The officer was in the SUV, and he sustained minor injuries and was taken to the hospital. The driver of the car was found to be intoxicated and arrested.

The freeway was shut down for hours.