Crashing a state dinner at the White House apparently takes a security breakdown as well as some kind of nerve.

The Secret Service is looking into its own security procedures after determining that a Virginia couple, Michaele and Tareq Salahi, managed to slip into the Tuesday night's event though they were not on the guest list, agency spokesman Ed Donovan said.

President Barack Obama was never in any danger because the party crashers went through the same security screening for weapons as the 300-plus people actually invited to the dinner honouring Prime Minister Manmohan Singh, Donovan said.

Donovan confirmed the identities of the couple. The Washington Post, which first reported on their evening out, said the Salahis were well-known in the Virginia horse-country set.

The Secret Service learned about the security breach on Wednesday after a media inquiry prompted by the Salahis’ online boasts about having attended the private event, Donovan said.

One of the many photos from the dinner posted on Michaele Salahi’s Facebook page shows the couple with a smiling Vice-President Joe Biden. In other photos, they appear alone or together with White House chief of staff Rahm Emanuel, Washington Mayor Adrian Fenty, CBS News anchor Katie Couric, Rep. Ed Royce and three Marines in their dress blues.

Donovan would not comment on whether the couple had been contacted by the Secret Service, how long they were on the White House grounds or other details of the investigation.

The agency’s Office of Professional Responsibility was reviewing what occurred. An initial finding indicated that a checkpoint did not follow proper procedures to ensure the two were on the guest list, Donovan said.

“It’s important to note that they went through all the security screenings - the magnetometer screening - just like all the other guests did,” Donovan said. And, he added, Obama and others under Secret Service protection had their usual security details with them at the dinner.

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