Witnesses said the Egyptian army on Wednesday secured a military barracks where President Mohammed Morsi was working with barbed wire and barriers, Reuters reported.
Armored vehicles and troops were also deployed to prevent Morsi supporters from marching to the presidential palace, according to witnesses. A Reuters journalist saw troops in formation close to a rally where tens of thousands of Muslim Brotherhood supporters gathered.
The army said that it was securing the area and denied what it said were reports that the military is attacking Morsi supporters.
"The Egyptian army belongs to all Egyptians," the military said in an official statement, as quoted by Reuters.