Violence continued in Yemen's capital of Sanaa on Sunday as Yemeni President Ali Abdullah Saleh called for early elections, months after returning to the embattled country after being treated for life-threatening injuries in Saudi Arabia.In Sanaa, soldiers used live rounds against thousands of protesters chanting "God is great, Freedom" as they marched out of their protest camp into the capital's busy streets."I saw soldiers from above, in buildings and on the bridge," said Mohammed al-Mas, 21, a protester whose back was drenched in blood from a gunshot wound. "Then the gunfire started and I ran back, but I suddenly felt the shot in the back."Medics said two of the 18 wounded were in critical condition. Doctors spattered with blood worked on bullet wounds at a makeshift hospital in "Change Square," the name protesters have given to their shanty town of tents in the middle of Sanaa.