Mustafa Amine Badreddin had long eluded Arab and western forces.
Further tightens flow of asylum seekers trying to escape war.
Fears of a power vaccuum loom after the third aborted vote by lawmakers divided over Syria.
U.N. agency calls it "devastating milestone."
16 killed in violence between pro- and anti-Assad factions.
Men were attempting to cross into Lebanon through a border town.
Air strikes said to have hit in area with strong militant presence.
Al Qaeda-linked group claims responsibility for attacks.
Though the fragile nation still needs a president, it looks far more stable than even a week ago.
A car-bomb targeting a Shiite area in Beirut killed four people.
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