Plain-clothed gunmen opened fire on protesters in Yemen’s southern city of Taiz on Saturday, wounding at least 15 people.
Yemeni protesters demanding President Ali Abdullah Saleh’s immediate resignation vowed to step up street protests.
Yemeni President Ali Abdullah Saleh agreed on Saturday to step down in weeks in return for immunity from prosecution.
Members of Yemen’s ruling party formed a new bloc on Monday to support protests against the rule of President Ali Abdullah Saleh.
Opponents of Yemen’s President Saleh stepped up a campaign to force him out on Friday, but Saleh was defiant, urging opposition to join peace talks.
Protests erupted across much of the Arab world on the Muslim day of prayer, with demonstrators killed in Syria and Yemen.
Yemen’s president urged the opposition to join talks to try to end weeks of turmoil and violence in which three more people were killed on Tuesday.
Police and armed men in civilian clothes opened fire on anti-government demonstrators in Yemeni cities on Monday, leaving 15 dead and dozens wounded.
Yemeni President Ali Abdullah said on Friday he was ready to cede power, the third Arab ruler who may be forced out by popular protests.
Top generals, ambassadors and some tribes threw their support behind Yemen’s anti-government protesters on Monday.