UPDATE 07:52pm 01/30/2012: According to WJZ in Baltimore, the plane skidded off the runway and is currently stuck in the mud. There were two people on board, neither of whom were injured .
UPDATE 07:37pm 01/30/2012: There appear to be no injuries.
UPDATE 07:23pm 01/30/2012: Unconfirmed reports from the airport (not an official source) say that it was a small private jet, possibly a Gulfstream G-IV which experienced a mechanical problem with the front landing gear.
Fire crews are responding to a plane that has skidded off the runway at BWI Thurgood Marshall International Airport. Initial reports indicate that it is a small jet. There is no word if it is a private jet or a regional jet for commercial use. Details coming.