The conflict between rebels and the Syrian government is intensifying.Now U.S. officials say there is "movement activity" around Syria's chemical weapons sites.Experts say it is a dangerous sign that a war involving weapons of mass destruction might be about to begin.Tim Brown is a security analyst with Globalsecurity.org.He says sarin gas is among the most lethal weapons in existence.Unless you're in a full body suit and have a fully sealed gas mask, two to three parts per million will kill you.It's a nerve agent," said Brown.The threat of sarin gas is not new.Members of a cult used it in a Tokyo subway attack that killed 13 people in 1995.Iraq, under Saddam Hussein, possessed it in its arsenal of weapons of mass destruction.Saddam's use of other types of poison gas against Iranian troops in the Iran-Iraq War and against Iraq's Kurdish population in the 1980s was criticized by the international community,but there were no threats of military action against Baghdad by the United States and its allies at the time.Analyst Tim Brown says the international community has evolved.The U.S. and the West are powers that decided that the use of chemical weapons - the use,- is not going to be tolerated," he said.That was clear in 2003 when the United States went to war with Iraq on the belief that it still possessed weapons of mass destruction.
