63 semi-automatic guns go missing from La.-bound truck; 4 arrested Updated 7:39 PM ET Four men were arrested in connection to the case, CBS affiliate KSLA Shreveport reported Tuesday. The missing guns have yet to be recovered. According to a statement posted on the Caddo Parrish Sheriff's Office web site, the four men arrested are: Cameron Johnson, a contract security guard who was on duty when the guns were supposed to have arrived at shipping company Con-way, on the charge of theft of a firearm; Luther Williams Jr. for theft of a firearm; James D. Minor Jr., on drug, traffic and firearm charges; and David McNeil for illegal possession of stolen items. All the suspects were not employees of Con-way. The memo from the Caddo Parish Sheriff's Office says the weapons were among a shipment of five pallets traveling between Connecticut and Louisiana, one of which disappeared along the way. Officials from Con-way that misplaced the weapons, told law enforcement that the pallets were scanned as a group, not individually, at each checkpoint. "We've been involved in the investigation with the Sheriff's Office since day one," said Senior Special Agent Austin Banks of the ATF New Orleans Field Division. Officials from Con-way Inc. and Colt Manufacturing were unavailable for comment. "The company continues to fully cooperate with the Caddo Parish Sheriff's Office on its investigation," said the sheriff's office on its Web site The sheriff's office also said the investigation is ongoing and that someone may have purchased a weapon unaware that it was stolen. "Anyone recently acquiring this type of weapon from anyone other than an authorized or legitimate dealer is encouraged to contact the Sheriff's Office," it said.