The Secret Service has found a bullet that smashed a glass window at the White House before being stopped by special anti-ballistic glass shielding the building's interior, WRC-TV reported late Tuesday night.

It was discovered Tuesday morning, said a Secret Service official who added a second bullet was found outside the building.

The Secret Service has been investigating a shooting that occurred near the White House on Friday, but sources told the station they could not yet confirm that the newly discovered bullets are linked to that incident.

An AK-47-style rifle was recovered from an abandoned car Friday night after Secret Service officers heard shots being fired between two vehicles on Constitution Avenue, about half a mile (800m) from the White House, shortly after 9:00pm.

US Park Police spokesman Sgt. David Schlosser said Sunday officers had obtained an arrest warrant for 21-year-old Oscar Ramiro Ortega, on a felony charge of carrying a dangerous weapon, in connection with the incident. The U.S. Secret Service said they found evidence in the vehicle that tied it to Ortega. 

Ortega, who is believed to have ties to Idaho, is thought to have remained in the Washington, D.C. area following Friday's drama.

US President Barack Obama and First Lady Michelle Obama were in California at the time of the shooting then traveled to Hawaii for the Asia-Pacific Economic Cooperation forum.

News of the bullets' discovery broke shortly after the president landed in Australia for a brief 27-hour visit.

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