Timeline of the Yemeni Revolution (January – 2 June 2011) Al Jazeera said Yemen had increased security the next day. Human Rights Watch said that demonstrators celebrating the ouster of Hosni Mubarak in Egypt turned violent when hundreds of men armed with knives, sticks, and assault rifles attacked the protesters. By noon, at least 4,000 protesters gathered to demonstrate in Sana'a, with numbers expected to rise. Approximately 5,000 police with clubs and government supporters beat the anti-government protesters who were celebrating the resignation of Egyptian President Hosni Mubarak and were also demanding the removal of Saleh. Protesters also tried to reach the Egyptian embassy in Sana'a, but police forces kept
Muslim Brotherhood in post-Mubarak electoral politics of Egypt rule and frequently imprisoning the movement's members. Muslim Brotherhood members joined the protests and demonstrations beginning in late January 2011, but the organization initially kept a low profile and refrained from seeking a leadership role in the uprising. At the same time, being the largest and best organized opposition force, its participation and support were essential for an eventual success of the opposition movement. The opposition's initial demands were concerned mainly with the removal of President Mubarak and his regime, seen as a precondition for any meaningful reform. The Brotherhood gradually assumed a more assertive role, culminating with the statement