Experts say you simply can't safely bomb a chemical weapons storehouse into oblivion. That's why they say the United States is probably targeting something other than Syria's nerve agents.

But now there is concern that bombing other sites could accidentally release dangerous chemical weapons that the U.S. military didn't know were there because they've lost track of some of the nerve agents.

Five chemical weapons experts tell The Associated Press that bombing stockpiles of such weapons — purposely or accidentally — would likely kill nearby civilians in an accidental chemical release, create a long-lasting environmental catastrophe or both. That's because under ideal conditions explosives would still leave at least 20 to 30 percent of the poison in lethal form. And in Syria, the levels would likely be higher.