The FBI says it's concerned about the 2 propane trucks that were stolen this weekend and still missing. They say propane is wanted in Mexico and so it may have nothing to do with terrorists. But in addition there were 15 gas canisters stolen from an ambulance supply company there also. Five of the stolen canisters were empty, but others contained nitrous oxide, carbon dioxide and oxygen. They could be used as "improvised explosive devices" according to the article. It is so sad that terrorism has made us worry so but I have to admit this worries me. It's just not so easy to get across the Mexican border anymore, especially with trucks containing substances so if the trucks were headed there why haven't they been found? I'm sure someone can think of an answer but I'm perplexed what use anyone would have with those gas canisters too. 
