DALLAS (CBSDFW.COM) – Traffic was tied up for more than an hour Thursday afternoon on the Dallas North Tollway. The multi-car accident resulted in the intermittent closure of lanes between Keller Springs and Trinity Mills.

Michael Ray with the North Texas Tollway Authority (NTTA) confirmed that part of the crash started on one side of the toll and ended on the other.

“It appears at least one vehicle went over the barrier there at Keller Springs and it’s affected both sides of the Tollway,” he said.

Thursday afternoon, Ray said investigators didn’t know what triggered the accident. “Right now we’re working the situation to get that buttoned up, get the vehicles out of there, there were already some wreckers on scene. And then relieve the traffic congestion, [and] then DPS will do the investigation and we’ll find out what happened.”

For law enforcement the first concern was to clear the scene. “We’re trying to get a little bit of traffic through there, but for a time we may see both sides of the Tollway diverting traffic until we get all of the vehicles off of the Tollway,” said Ray.

There are no reports of anyone being injured.

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