Police say hundreds of members of the Muslim Brotherhood, Egypt's most powerful opposition group, have staged demonstrations across northern Egypt. They accuse the government of preventing them from participating in elections. A security official says that 700 demonstrators in Nile Delta city of Tanta city hurled stones at police, which responded by firing tear gas. Demonstrations have also taken place Tuesday in the port city of Alexandria and the province of Sharqiya. Thousands of the group's candidates were prevented from registering for local council elections set for April 8. Later the group won law suits reversing these decision but the government has refused to implement the verdicts.