MIDLAND, Texas » Authorities say four people are dead and 17 are injured after a train slammed into a parade float headed to a West Texas event honoring wounded veterans.

The eastbound train was sounding its horn before it hit the float around 4:40 p.m. in Midland, Union Pacific spokesman Tom Lange said. A preliminary investigation indicates the crossing gate and lights were working at the time, Lange said, though he didn’t know if the train crew saw the float approaching.

Two people died at the scene of the crash, while two others died at Midland Memorial Hospital, City of Midland spokesman Ryan Stout said. Seven of those injured are in critical condition, while the 10 others are in stable condition, he said.

"There is going to be a very thorough investigation," Lange said. "It’s obviously a very tragic incident."

Photos of the float taken during the parade show about two dozen people seated in chairs set up on the back of a flatbed tractor-trailer decorated with American flags and signs identifying each veteran. A banner across the truck’s front bumper reads, "Heroes on Board."

The float was among two flat-bed trucks carrying veterans and their spouses, police said. The first truck safely crossed the railroad tracks, but the second truck’s trailer was hit by the train. Police said some of the people on the second trailer were able to evacuate before the crash.

The parade was to end at a "Hunt for Heroes" banquet honoring the veterans. The wounded service members were then going to be treated to a deer-hunting trip this weekend. The events have been canceled.

Lange said Union Pacific is offering help to the community and victims’ families, as well as peer-to-peer counseling for the train crew, who did not sustain any injuries.

"It’s pretty traumatic for them," he said.

The National Transportation Safety Board also is investigating, NTSB spokesman Peter Knudson said.

Midland is about 320 miles west of Dallas.