Egyptian police fired tear gas and rubber bullets and beat protesters to clear thousands of people from a central Cairo square last night after the biggest demonstrations in years in the country.Reports say that two protesters and a police officer were killed in the nationwide demonstrations inspired by Tunisia's uprising, which also demanded a solution to Egypt's economic issues.Egytian media Al Ahram quoting Egyptians say that the Twitter Web site is blocked on all Internet Service Providers in their country.U.S. Secretary of State Hillary Clinton has urged all sides in Egypt to exercise restraint and said she believed the Egyptian government was stable and looking for ways to respond to its people's aspirations.