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Two bullets have been found at the White House, one of which struck a protective window when it was fired, the US Secret Service says.

The casings were found on the grounds during a probe launched after gunshots were fired nearby late last week.

The US Parks Police now says it is searching for a 21-year-old man, Oscar Ramiro Ortega, over the shooting.

The bullets have not yet been "conclusively connected" to the shooting, the Secret Service told AFP.

"An assessment of the exterior of the White House is ongoing," the service told the news agency.

Tattoos

The discovery of the bullets, which were found on Tuesday, follows reports of gunfire between the White House and the Washington Monument at about 21:30 local time on Friday evening.

Oscar Ortega has been linked to Friday evening's shooting

Witnesses heard shots and saw two speeding vehicles in the area. An AK-47 rifle was also recovered, the Associated Press reported.

In a blog post issued by the US Parks Police, Sgt David Schlosser said the investigation into the shooting near the White House had led to them to issue a warrant for the arrest of Mr Ortega.

"As the investigation unfolded, the US Park Police located a vehicle in the 2300 block of Constitution Avenue," Sgt Schlosser said, some seven blocks away from the White House.

"Evidence in the vehicle led to us obtaining an arrest warrant for Oscar Ortega."

Mr Ortega is described as a white Hispanic male of medium build, with several distinguishing tattoos - including three dots on his right hand, his name across his back and the word Israel tattooed on his neck.

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