It appears that AF55 from Washington Dulles and AF65 from Los Angeles, both to Paris, have diverted. There are reports that AF65 received a bomb threat and so diverted to Salt Lake City. It landed at 19:11 local time and is scheduled for departure at 00:11 with a new arrival at 17:09. A friend of mine is on this flight, and as she is a Mod at Flyertalk.com, I am sure we will hear more about what happened.
The flight from DC landed in Halifax, Canada. It is due to leave at 00:35 local time and land in Paris at 10:56, about three hours late.