The Armed Forces have surrounded the State Security compound in Muqattam to prevent any possible attacks by protesters.
Eyewitnesses on the scene say that the Armed Forces have even stopped employees of the general prosecution from entering the building to inspect the prisons and study the documents.
There is speculation that Reda Helal, an Al-Ahram journalist who disappeared six years ago, may be inside the building.
In the last few days, protesters have stormed the State Security headquarters in both Nasr City and Lazoghly.
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