Troops clash with protesters in Yemen (12 images)

Relatives and anti-government protestors pray over the coffins of protesters killed during recent clashes with security forces during thier funeral procession in Sanaa, Yemen, Sept. 25, 2011. Yemeni medical officials say government troops have opened fire on protesters in the capital Sanaa, wounding at least 18 people. The shooting signals President Ali Abdullah Saleh's regime is stepping up its crackdown on the opposition following the leader's surprise return home that coincided with a dramatic surge in violence . UPI/Mohammad Abdullah

A protestor with Yemen's flag painted on his face, center, shouts slogans his march during a demonstration demanding the resignation of Yemen's President Ali Abdullah Saleh in Sanaa, Yemen, Sept. 25, 2011. Yemeni medical officials say government troops have opened fire on protesters in the capital Sanaa, wounding at least 18 people. The shooting signals President Ali Abdullah Saleh's regime is stepping up its crackdown on the opposition following the leader's surprise return home that coincided with a dramatic surge in violence . UPI/Mohammad Abdullah

Doctors look after an anti-government protester, who was shot and wounded by the security forces loyal to President Ali Abdullah Saleh, at a makeshift hospital in the capital Sanaa, on September 25, 2011. Yemeni medical officials say government troops have opened fire on protesters in the capital Sanaa, wounding at least 18 people. The shooting signals President Ali Abdullah Saleh's regime is stepping up its crackdown on the opposition following the leader's surprise return home that coincided with a dramatic surge in violence . UPI/Mohammad Abdullah

A protestor with Yemen's flag painted on his face, center, with others as they march during a demonstration demanding the resignation of Yemen's President Ali Abdullah Saleh in Sanaa, Yemen, Sept. 25, 2011. Yemeni medical officials say government troops have opened fire on protesters in the capital Sanaa, wounding at least 18 people. The shooting signals President Ali Abdullah Saleh's regime is stepping up its crackdown on the opposition following the leader's surprise return home that coincided with a dramatic surge in violence . UPI/Mohammad Abdullah