AMMAN, Jordan — Secretary of State John Kerry said Wednesday that the United States was increasingly concerned that the escalating fighting in Syria might slip across the border with Lebanon and destabilize that country. “We’re deeply concerned about this spilling over into Lebanon,” said Mr. Kerry, who came to Jordan to attend an 11-country meeting on the deteriorating situation in Syria.

Lebanon, Mr. Kerry added pointedly, is “at risk.” The decision by Hezbollah, the Lebanese militia and Iranian ally, to join the battle for the strategic city of Qusayr in Syria, and the prospect that the Syrian rebels might respond by carrying the fight to Hezbollah operatives in Lebanon, has alarmed the Obama administration. [Link]