Egypt's armed forces deployed security cordons on Monday on all main roads into Cairo and Giza.
According to Ahram Arabic news website, traffic has been partially halted in some of those streets by the interior ministry, in an attempt to tighten security and find the culprits behind what they described as an attempt to raid the Cairo headquarters of the Republican Guards at dawn on Monday.
At least 42 people were killed and 300 injured in violent clashes on Monday morning between supporters of deposed president Mohamed Morsi and the army.
Morsi’s Muslim Brotherhood claimed that a peaceful pro-Morsi sit-in was attacked by the military during dawn prayers, while the military stated that an “armed terrorist group” had attacked the Republic Guard headquarters, leading to the deaths.
The army said that the attack left one officer killed and 40 soldiers were injured, in addition to seven in critical condition.
A military source told Ahram that the armed forces are urging all citizens to remain peaceful and not approach any military institute, stating that they will strongly confront any assault against military or sovereign institutes.
The Muslim Brotherhood has been leading a sit-in for several days in front of the Republican Guards building to demand the return of deposed president Mohamed Morsi.
Initial investigations by the prosecution found remains of Molotov cocktails, and bullet and birdshot casings at the site of the clashes.