A recent secret White House meeting revealed that an estimated 20,000 portable, heat-seeking missiles appear to have vanished from an Army warehouse in Libya, ABCNews.com reported.

The new revelations stoke ongoing fears that such weapons, which are light, relatively easy to use and have the capacity to take down a commercial airplane, could end up in the wrong hands as the Libyan war that ousted Muammar Qaddafi winds down.

“Matching up a terrorist with a shoulder-fired missile, that’s our worst nightmare,” Sen. Barbara Boxer, D-Calif., told ABCNews.com.

Earlier this month, a senior U.S. official told the Associated Press that weapon proliferation was the “key concern” for the U.S. as Libya emerges from six months of civil war. To be sure, Libya has been struggling to secure many weapon caches.

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