Cairo ( CNN ) -- Thousands of demonstrators who gathered in Cairo 's Tahrir Square for a protest titled `` Day of Justice and Cleansing '' confronted two officers and sent them running late Friday , according to a witness . The numbers in the square have swelled dramatically compared to last Friday 's rally , in part because the Muslim Brotherhood has now joined alongside secular , liberal groups to put pressure on the Supreme Council of the Armed Forces , which currently rules Egypt . Demonstrators stepped up their demands this week . Muhammad Taman , a spokesman for the January 25 Coalition , told CNN the diverse collection of political groups are demanding Egyptian authorities bring ousted president Hosni Mubarak before a court for his alleged role in the deaths of hundreds of activists last January and February and on corruption charges . If Mubarak is not prosecuted , Taman said , activists are prepared to organize a march towards the Red Sea resort of Sharm el-Sheikh , where Mubarak has been living on his estate since he stepped down from office on February 11 . `` This is the army 's last chance , '' Taman warned . Mubarak 's eldest son , Gamal , is expected to appear before the Justice Ministry 's Illicit Profiteering Committee on Sunday . Meanwhile , Mubarak 's long-time chief of staff , Zakaria Azmi , was questioned and then arrested on Thursday by Egypt 's general prosecutor . Azmi is being investigated for alleged corrupt activities . He was shown on Egyptian television Friday being escorted to a vehicle by uniformed Egyptian police while bystanders chanted , `` Thief , thief ! '' An army lieutenant colonel and a military police officer tried to walk to the center of square , where they were surrounded by demonstrators who chanted `` get out , get out , '' said journalist Mohamed Fadel Fahmy , who witnessed the incident . Within moments , members of the crowd began pushing the officers and knocking their hats off their heads . `` The officers got scared and started running and they were pursued , '' said Fahmy . Demonstrators are protecting 15 army officers and soldiers who broke ranks with the Egyptian military and joined Friday 's Tahrir Square protest , ignoring a warning from the top military brass that any uniformed troops participating in the rally would be arrested . Some of the officers addressed the demonstration , demanding Egypt 's ruling military council be replaced by a presidential committee of civillians .
NEW : Two Egyptian officers forced to leave square , witness says . Numbers of demonstrators have swelled because the Muslim Brotherhood has joined . Groups are seeking prosecution of former president Hosni Mubarak . Comment: