As the protests stretched into a second week, opponents of Mr. Saleh appeared divided. A formal coalition of opposition parties organized earlier demonstrations that extracted concessions from him, including a pledge to stand down in 2013. For the moment they appear content to push for greater concessions under that timetable.  But a younger cohort of opponents is pressing for Mr. Saleh’s earlier departure, organizing their resistance — as elsewhere — using cell phone text messages and Facebook.  The delicate position of the United States seems as evident in Yemen as it is in Bahrain, where pro-American leaders have cracked down on adversaries on the street clamoring for the monarchy to make way for democratic change. Demand for reform has already toppled the leaders of Tunisia and Egypt, both close allies of Washington.  Antigovernment activists here are increasingly concerned about the government’s apparent deployment of out-of-town Yemenis paid to disrupt their protests. “These guys are not from Sana,” said Ibrahim el-Farzy, a shopkeeper.  Southern secessionists have also renewed their protests in the port city of Aden, where demonstrations have been notably more violent. One protester, about 20 years old, was said to have been shot to death in battles with the police on Wednesday, according to reports from the city, as hundreds took to the streets in several neighborhoods.  Though Yemen’s southern secessionists have also sought inspiration from a regional wave of protests their demand for independence is longstanding and their goals differ from those of the students protesting against Mr. Saleh in Sana and other areas, including Taiz, which is not part of the area that secessionists have claimed.  J. David Goodman contributed reporting from New York, and Alan Cowell from Paris.
Pro-government demonstrators armed with sticks ran down rivals calling for the ouster of President Ali Abdullah Saleh on Friday.