Egyptian police have clashed with dozens of protesters criticizing President Hosni Mubarak's bid to extend his 24-year rule.
Protest organizers say plainclothes officers Saturday attacked and arrested protesters, including leaders of the Kefaya opposition group. Some of them were later released.
Critics of the government called the protest two days after Mr. Mubarak announced plans to compete for a fifth term in September voting. It will be the first time he has faced challengers for the post, and it comes after the government approved electoral reforms.
Opposition leaders say Saturday's violence was similar to clashes between police and protesters during a May referendum.
Last month, U.S. Secretary of State Condoleezza Rice visited Egypt and urged the government not to interfere with peaceful protests.
Some information for this report provided by AP and AFP.