Greg in Beirut (on Fox...didn't look up to see him, but I'm thinking it was Greg Palcott (sp?)?) said that they are hearing the same reports of some sort of aircraft (Israeli) down and that they hear fireworks and celebration in South Beirut, similar to what they heard the other night when the ship got hit.
Someone on MSNBC saying they saw something (perhaps a rocket he said) spinning and then impact in Beirut. He is also reporting celebrations.
MSNBC has video from Al Jaz. (and apparently the guy on the ground in Beirut has tape they took of a similar thing) showing something spiraling crashing.
He (and Israeli sources) saying they do not believe it was a plane or aircraft, but they believe that falling object is what is causing all the celebration.