The Tahrir sit-in is in its second month. Protesters took over Tahrir to protest against Morsi's moves to pass a disputed constitution. Despite the charter passing in a referendum, the protesters stayed in the square, demanding the constitution be amended.
Some have hanged banners against Morsi and his Muslim Brotherhood group. One reads: "The people have impeached the president."
Mohammadein said it was not the first time the protesters came under attack. Activists have also been briefly kidnapped and released and the cases were never investigated, he said.