SANAA, Yemen — Yemeni riot police in the capital shot dead a protester and injured five others today when they opened fire on thousands marching in the 10th day of unrest rocking the country.

Protesters began marching early in the morning from the University of Sanaa to the Ministry of Justice while chanting, “the people want the fall of the regime,” until they were met by riot police and supporters of the president.

The president’s supporters armed with clubs and knives attacked the crowd and engaged in a stone throwing battle while at one point police fired in the air to disperse the march.

A medical official said one man was shot in the neck and killed. He spoke on condition of anonymity because he was not authorized to speak to the press.