Violence in a Hampton Roads classroom leaves one person injured.Preview: If you were planning to hop a flight or a train today in the DC region, be ready for the possibility of long delays or an extended stay locally. More than 400 flights today out of Reagan National have been canceled or significantly delayed and hundreds more flights out of Dulles and BWI have been affected as well. Amtrak is also warning of possible delays for Northeast corridor trains heading to and from destinations both north and south of DC.