Egypt is investigating a video which appears to show a Danish couple scaling the Great Pyramid and posing naked.
The alleged incident has sparked outrage in the conservative Muslim country.
Prosecutors will explore whether the video is real, and if so how they were able to climb the 140m (460ft) tall structure, state-run newspaper Al-Ahram reports.
Officials had initially suggested the footage might be fake.
The Great Pyramid of Giza, also known as Khufu or Cheops, is one of the seven wonders of the ancient world
A photographer said he and a friend had spent several hours “sneaking around” before making the climb.
The Egyptian antiquities minister told MPs on Sunday that prosecutors were investigating whether the Danish couple “really filmed an explicit pornographic video” at the famous site in Giza.
Khaled al-Anani, quoted by Al-Ahram, said they have been asked to determine whether the video was real or fake, and to prosecute any officials found to be negligent.
Scaling the pyramids was “strictly forbidden”, he added, calling the images a “violation of public morality”.
BBC Africa
