( CNN ) -- A Texas grand jury declined to issue charges Thursday in a November 2012 deadly collision between a freight train and a parade float that killed four veterans and injured more than a dozen people , Assistant District Attorney Eric Kalenak of Midland County said . The accident happened on November 15 during the `` Hunt for Heroes '' parade to honor members of the U.S. military . The last flatbed truck in the parade was crossing the tracks when an eastbound Union Pacific train slammed into it , Midland police said . An attorney representing Smith Industries , the owner of the truck that served as the float , identified the driver as Dale Andrew Hayden . Civil litigation , however , is pending as the family of at least one deceased victim and several surviving victims , including one left paralyzed , are suing the railroad and Smith Industries , according to the website of the law firm Glasheen , Valles & Inderman in Lubbock , Texas . A second suit on behalf of families of two deceased veterans was filed in Dallas against the railroad , the law firm said . `` Of the twelve families who were on the float stuck by the train , nine have filed suit , '' the law firm said in a January announcement . Last year , the National Transportation Safety Board said the grade crossing warning system , which consists of a bell , lights and a gate , operated as designed , giving a 20-second warning of the train 's arrival . But the truck entered the crossing and the gate lowered , tipping over flag stands on the float . The board re-created the accident as part of an investigation . An NTSB board member said the south traffic light at the grade crossing turned green 21 seconds before the train 's arrival at the crossing , as designed , to allow traffic time to clear the crossing . At 20 seconds before the collision , the bells and lights on the mast activated , in keeping with the minimum time under federal law . Those killed were identified as Marine Corps Chief Warrant Officer 3 Gary Stouffer , 37 ; Army Sgt . Maj. Lawrence Boivin , 47 ; Army Sgt . Joshua Michael , 34 ; and Army Sgt . Maj. William Lubbers , 43 . CNN 's Amanda Watts contributed to this report .
Grand jury decides not to charge anyone , prosecutor says . But families on a parade float are suing railroad and owner of truck pulling float , a law firm says . Four veterans were killed and more than a dozen people were injured when train hit float . Accident happened during `` Hunt for Heroes '' parade to honor U.S. servicemen .