Here's what we know about Thursday's massive pileup in Fort Worth

FORT WORTH, Texas — Updated at 9:50 a.m. with victim identifications.

A chain-reaction crash occurred on Interstate 35W in Fort Worth around 6 a.m. Thursday. At least 133 vehicles were involved in the incident, officials said.

The accident scene stretched around 1 to 1.5 miles long, with Fort Worth police reporting the scene at 1601 North Freeway and MedStar reporting it at the conjunction of I-35W and 28th street.

Officials said Thursday evening that six people have died from the pileup crash. They also said 36 people were transported from the scene to local hospitals, and 65 people in the crash sought treatment from injuries either on-scene or at a local hospital themselves.

One woman who survived the crash said she had to crawl out her back car window to get to safety.

The Tarrant County Medical Examiner’s Office has identified five of the victims as of 9:50 a.m. Friday. Two were from Fort Worth, two from parts of Texas, and from Hawaii. 

Victims who have been identified: 

• Tiffany Gerred, 34, of Fort Worth
• Aaron Watson, 45, of Fort Worth
• Christopher Vardy, 49, of Boyd, Texas 
• Michael Wells, 47, of Justin, Texas
• William Williams, 54, of Pahoa, Hawaii

RELATED: 'A tragic day for the Fort Worth family': At least 6 killed in 133 vehicle pileup crash on I-35W in Fort Worth, officials say

Icy roads were an issue across the region due to freezing rain.

Officials with North Tarrant Express, which is where the crash happened, say that their maintenance crews started pre-treating corridors on Tuesday and have been spot treating them since then.

The Fort Worth Fire Department said its investigation, in part, would look into how the road was treated.

Read the full statement from North Tarrant Express Below: 

"We join the greater community in our thoughts for the accident victims, their families, and those recovering. NTE & NTE35W maintenance crews started pre-treating the corridors on Tuesday morning in anticipation of inclement weather, and have been treating continuously as they monitor the roadway. We will continue treating the highways through the weekend and into next week, as long as the storm is active. Our crews treat the entire corridor, managed lanes, general-purpose lanes, frontage roads, and ramps, and operate under the same procedure as the Texas Department of Transportation. Additionally, our message boards throughout the corridors have been alerting drivers of the adverse weather conditions and encouraging them to drive with caution. Currently, the crews are assisting emergency responders to manage the accident scene and clean up in order to reopen the corridor, safely."

The cause of the crash has not yet been determined.

Families were being reunited Thursday at Riverside Center at 3700 E. Belknap Street in Fort Worth, police officials said. Family members will be able to pick up their loved ones that were involved in the pileup there. Authorities are asking anyone who suspects their loved ones might have been involved to call 817-546-7826.

At least 30 people showed at the family reunion center, officials said. In addition to those at the Riverside Center, some officers drove people, who had been involved in the wreck to either their homes or workplaces since they had no ride. 

Authorities said those at the Riverside Center fall into one of two categories:

• They were one of the 30 people taken there, involved in the wreck, waiting for a loved one to pick them up.
• They had a loved one who may have been involved in the crash and are waiting for more information about them.