Sana'a: Anti-government protesters clashed with police trying to prevent them from marching towards Yemen's presidential palace in Sana'a on Sunday, witnesses said.
Shortly before the clashes, the opposition agreed to enter talks with President Ali Abdullah Saleh, who is keen to avert an Egypt-style revolt in the country, a US ally against Al Qaida.
Sunday's march came a day after Yemeni police armed with clubs beat anti-government protesters who were celebrating the resignation of Egyptian leader Hosni Mubarak and demanding the ouster of their own president.
Demonstrators on Sunday shouted slogans demanding for the immediate resignation of the president.
Opposition officials said 10 protesters were detained in Sana'a and 120 were taken into custody overnight in the city of Taiz, where authorities broke up a demonstration on Saturday.
Four people were hurt in the Sanaa clashes, in which police hit protesters with batons and demonstrators threw rocks at police, witnesses said.
Saleh has been in power for three decades and tried to blunt unrest by promising not to run again. His term ends in 2013.
Yemen is the Arab world's most impoverished nation and has become a haven for Al Qaida militants.