ADEN - Two more people died overnight after being shot during anti-government protests in Yemen's southern city of Aden, a doctor said on Saturday. That brought to four the number killed in clashes with security forces in Aden on Friday. Dozens were wounded. Twenty-one people have now been killed since February 17 in daily protests against President Ali Abdullah Saleh's 32-year rule. Unrest has been especially intense in the once-independent south, where many people resent rule from the north. Loyalists and opponents of the 68-year-old leader held rival demonstrations in the capital Sanaa after Friday prayers. Anti-Saleh protesters shouted slogans which have echoed around the Arab world since the uprisings in Egypt and Tunisia: "The people demand the downfall of the regime." Saleh supporters chanted their loyalty to a man they see as holding the impoverished tribal nation together. "The creator of unity is in our hearts. We will not abandon him," they cried.