"There are also sinister looking shells or warheads in the warehouses that may contain poisonous gas."

Well they may but I would very much doubt it. For safety and degradation issues related to what those shells or warheads have to filled with, you do not "arm" such weapons until you are about to use them - that process from authorisation to actually arming the munitions (Bombs, rockets, artillery shells or mortars) distributing them so that they are ready to go takes 45 minutes. That is what we, in the armed forces, learned during the "Cold War", that is what was confirmed to us by the new NATO member States who were formerly part of the Warsaw Pact. Now who was it again that told the world and its dog about Chemical and Biological weapons and 45 minutes again and was accused of lying?