Update at 1:55 p.m. ET: White House Is "Highly Skeptical":
At the White House this afternoon, spokesman Jay Carney said the U.S. is "highly skeptical" of the comments made over the weekend by international prosecutor Carla del Ponte, who said there are "strong, concrete suspicions but not yet incontrovertible proof" that rebels in Syria have used sarin gas.
We've been covering del Ponte's comments, and the reaction to them, through the day. Scroll down to see an earlier update and our original post.
This is MORNING EDITION from NPR News. Good morning. I'm David Greene.
Syria has accused Israel of flagrantly violating international law after a series of airstrikes on targets near the Syrian capital over the weekend. Now, Israel has not officially accepted responsibility, but Israeli sources say the targets included Iranian-made missiles bound for Hezbollah fighters in neighboring Lebanon.
Secretary of State John Kerry sets off for what he calls "a long overdue" trip to Russia on Monday, and Syria is likely to top the agenda.
But U.S.-Russian relations are frosty these days. The U.S. is imposing targeted sanctions on Russian human rights violators, while Moscow is preventing American families from adopting Russian children.