How many shoulder-fired missiles are on the loose in Libya?

Whenever the CIA uncovers a new plot overseas, like al-Qaeda’s latest scheme to blow up civilian aircraft using advanced, hard-to-detect explosives, people breathe a sigh of relief. But this is a multifront war, and almost by definition, the attack that gets you is the one you didn’t see coming.

For the past few months, I’ve been hearing private warnings about another threat to commercial planes — namely, the spread of shoulder-fired anti-aircraft missiles from Libya after the overthrow of Moammar Gaddafi’s regime. A State Department official said in February that Gaddafi had acquired 20,000 of these weapons, and that only 5,000 of them had been secured through a $40 million U.S. program to buy up loose missiles…

Here’s the scary part: Two former CIA counterterrorism officers told me last week that technicians recently refurbished 800 of these man-portable air-defense systems (known as MANPADS) — some for an African jihadist group called Boko Haram that is often seen as an ally of al-Qaeda — for possible use against commercial jets flying into Niger, Chad and perhaps Nigeria.