What we know about the fatal collision of the 405 and the 405 Freeway at the intersection of Highway 535 and I-35 in Dallas

AUSTIN, Texas — The fatal collision between the 405 freeway and I/35 in south Dallas left a total of nine people dead, including three children, police said Friday.

Dallas Police Chief David Brown said Thursday that three children were among the nine people killed.

He did not provide a specific age.

The accident happened in the afternoon, when a tractor-trailer overturned after hitting the 405, which was headed northbound, Brown said.

Brown said the truck then went into a rollover and slid on the freeway, then rolled onto its side.

It was one of a series of accidents that took place during the night that also left nine people injured.

The truck’s rear end also hit the median, which created a pileup and then rolled into the median.

All the people inside the truck were killed, Brown told reporters Friday.

I have seen what happens when you put a lot of people in one vehicle,” Brown said, adding that the crash involved an oncoming tractor-tractor and a vehicle that was traveling in reverse.

We don’t know how fast the truck was going.

But if it had hit the freeway or the median before, it would have been in a position to have hit somebody in the median,” he said.

“It could have caused a very significant crash, and we have not been able to determine exactly what happened.

Dallas police say the tractor-trac truck involved in the crash is a newer model.

Investigators said there is no indication that the truck’s brakes were faulty or the driver did not stop in time.

At least three vehicles in the truck came to rest in the northbound lanes of the freeway as a result of the accident, police and fire officials said.