White House under attack: Gun shot hits exterior window

The Secret Service is investigating how a bullet hit an exterior window of the White House.  A round was stopped by ballistic glass behind the building's historic exterior glass.  

The Secret Service also tells ABC news that one additional round was also found on the exterior of the White House.  Both rounds were discovered Tuesday morning. The investigation started after an incident on November 11, when gunshots were heard near the White House.

The Secret Service has not yet conclusively connected Friday's incident with the bullets found on White House grounds.

The Secret Service, Park Police, D.C. police and Arlington police all responded to the reported shooting at 9:30 p.m. on Friday night. Investigators found an assault rifle in a car abandoned near the Theodore Roosevelt Bridge.

It was not an AK-47, as suggested in previous reports, and the owner of the gun is unknown at this time. Evidence from the car linked it to 21-year-old Oscar Ortega-Hernandez. Ortega was stopped by police in Arlington for a field inquiry that Friday, but was released.