LEESBURG, Va. (WUSA9) -- A spokesperson with the Loudoun County Fire Department says firefighters are responding to a house fire in the 1800 block of Castleguard Court in Leesburg. The home is a three story single family home and authorities say the family self-evacuated before crews arrived. The fire reportedly started in the rear of the home and Loudoun Fire reports no injuries at this time. The cause of the fire is under investigation. There is a significant amount of smoke, which the spokesperson says you can see from Sterling.