The Washington Post said the man rushed in through the front door of the White House and ran into the ceremonial East Room, one floor below the private residence of President Barack Obama and his family.
The man, Texas native Omar Gonzalez, was eventually intercepted outside the Green Room, an ornamental chamber that overlooks the South Lawn of the White House - on the opposite side of the building from the main North doors, through which he entered.
After the incident, on September 19, the Secret Service said in a statement that Gonzalez was "physically apprehended after entering the White House North Portico doors."
Another Secret Service spokesman was quoted as saying the man was stopped "just inside" the North Portico doors.
There was no immediate comment from the US Secret Service about the latest Washington Post report.
But the revelation comes on the heels of another embarrassing report for the Secret Service at the weekend.
First Lady Michelle Obama was reported to be furious about the incident which took place when she and her husband were out of town.
In all, at least seven bullets struck the upstairs residence of the White House, fired from a car parked some 700 meters away across the South Lawn.
The Secret Service has launched an investigation into the Gonzalez incident, which appeared to highlight deep failures of security by the elite presidential protection team around the White House.
Incidents in which people jump over the fence or throw objects into the grounds around the White House are not unusual.
But it is believed to be the first time an intruder actually penetrated the White House, which is protected by marksmen, dogs and uniformed Secret Service officers.
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