Yemenis shout slogans during a demonstration outside the presidential palace in Sanaa, Yemen, Aug. 8, 2012. Thousands of Yemenis launched a demonstration here, showing support for President Abd-Rabbu Mansour Hadi to reform army and security forces. (Xinhua/Mohammed Mohammed)

Yemenis shout slogans during a demonstration outside the presidential palace in Sanaa, Yemen, Aug. 8, 2012. Thousands of Yemenis launched a demonstration here, showing support for President Abd-Rabbu Mansour Hadi to reform army and security forces. (Xinhua/Mohammed Mohammed)

Yemenis shout slogans during a demonstration outside the presidential palace in Sanaa, Yemen, Aug. 8, 2012. Thousands of Yemenis launched a demonstration here, showing support for President Abd-Rabbu Mansour Hadi to reform army and security forces. (Xinhua/Mohammed Mohammed)

Yemenis shout slogans during a demonstration outside the presidential palace in Sanaa, Yemen, Aug. 8, 2012. Thousands of Yemenis launched a demonstration here, showing support for President Abd-Rabbu Mansour Hadi to reform army and security forces. (Xinhua/Mohammed Mohammed)