Acting Prosecutor-General Ali Omran has issued a media gag order on investigations into the assassination of his predecessor Hisham Barakat.
The order will apply to audio, video, and print media, as well as internet sites.
It will remain in force until the end of investigations. The prosecutor-general's office will issue statements about the case and its updates.
On Tuesday, a TV show as well as several news websites in Egypt showed a photo of a former army officer who is allegedly a suspect in the assassination of Barakat.
Barakat died after a car bomb attack on his convoy in Cairo on Monday.