Security was breached at Windsor Castle for the second time in a week, it was claimed by a Sunday newspaper.
The newsmen said they drove up close to the castle
Sunday Mirror reporter James Saville and a photographer said they were allowed into an area around the castle.
Six days ago stand-up comedian Aaron Barschak sparked an investigation after he gate-crashed Prince William's 21st birthday party at the castle.
The protected secure area of Windsor Castle and its grounds were not breached
Scotland Yard spokeswoman
Scotland Yard denied the latest incident amounted to a second security breach, stressing that no members of the Royal Family were inside the castle at the time.
The Sunday Mirror reporter said no security checks were made on him and his colleague Neil Hall before they were permitted after they told staff they were picking someone up.
Mr Saville said the two newsmen drove around the private area of Home Park for 30 minutes and got close to the castle itself after telling a gatekeeper they were picking up a senior housemaid.
After the incident on Thursday, photographer Neil Hall said he was visited by police who were
investigating the unauthorised vehicle hired under his name.
A Scotland Yard spokeswoman said: "A vehicle was allowed into Home Park after being admitted by a member of estate staff.
"The protected secure area of Windsor Castle and its grounds were not breached."
She added that the same people tried to get inside again the following day and were refused entry but were allowed to turn their car around at an entrance gate
to avoid reversing into traffic.
Speaking about both incidents she said: "The secure protected area was not breached at any stage and no members of the Royal family were in residence."
She confirmed the vehicle was investigated by officers who discovered the men were representing the media.
Comedian Aaron Barschak sparked an investigation into security at the royal residence after he was able to walk into Prince William's party last Saturday.
He claimed he kissed the young Royal on both cheeks.