Two propane-delivery trucks were found on June 2 after being stolen from Ferrellgas over the prior weekend, a theft that raised fears of what could happen if terrorists got hold of the explosive fuel, according to a June 3 report by the Associated Press.The trucks were found on a highway just outside of Laredo. The police do not suspect that terrorism was behind the thefts. But officials said that since Sept. 11, such a possibility cannot be ignored. “Four years ago, we probably would not be too concerned about this,” San Antonio FBI agent Patrick Patterson said Wednesday on NBC's ‘Today.’ “It would be a major theft and handled like any other criminal investigation. Because of the nature of the day, we are very, very concerned about the whereabouts of these two trucks.”One of the tankers carried about 3,000 gallons of propane, while the other held 2,600 gallons, police said. The trucks were taken from a parking lot owned by Ferrellgas and have the company logo on them. Another FBI spokesman, Rene Salinas, said the market for propane in Mexico is strong and that the thieves could have been filling an order, mirroring a similar theft about nine months ago. A nationwide alert has been posted and law enforcement officials in Mexico also have been contacted, he said.