Anti-government protests are spreading to other Arab nations following the ouster of Tunisia's longtime ruler Zine El Abidene Ben Ali.
In Yemen, about 2,500 students and activists gathered at a university in Sanaa on Saturday, calling for the resignation of President Ali Abdullah Saleh. Saleh has been running the country for 32 years.
AP news agency reported that the protesters chanted, "Get out, Ali. Join your friend Ben Ali."
This is a major turnaround from demonstrations about a week ago, during which protestors did not refer to the president by name.
On Sunday, police briefly arrested a cameraman who was filming a protest, apparently as part of government efforts to restrict media coverage.
In Algeria and Jordan, people dissatisfied with their governments have also begun taking to the streets.