Accident - Clarendon/Rosslyn - Friday 11-Jan

I'm told there was a serious accident in Arlington on Friday Morning, probably on Clarendon Blvd. My source said the bike was run over, but they didn't have info on the cyclist. Does anybody have info about this accident? I ride this route several times a week, and would like to know what happened (to avoid a repeat). I also know several other folks who ride in that area. I hope whoever was involved is OK. Thanks. George Moore