Around 3,000 people are protesting in Yemen for a fifth consecutive day to demand political reforms and the ouster of the country's US-allied president.
A small contingent of police tried to disperse the demonstrators using tear gas and batons but the protesters have continued their march Tuesday from Sanaa University toward the city center.
The demonstrators - mainly university students and rights activists - are chanting slogans against President Ali Abdullah Saleh, including "down with the president's thugs."
A heavy police force and about 2,000 pro-government supporters are waiting for the protesters in the city center. The demonstration is expected to get larger as hundreds of people, students and rights activists are joining it as it moves through the city.