The United States delivered a blunt message to Syria and its allies yesterday that any attempt to "topple" the Lebanese government would result in failure.Tony Snow, the White House spokesman, said that there was mounting evidence that the Damascus regime and its Iranian allies in Teheran were backing Hizbollah's attempt to bring down the Lebanese government in order to derail an international tribunal into the assassination last year of Rafik Hariri, the former Lebanese prime minister. "Support for a sovereign, democratic and prosperous Lebanon is a key element of US policy in the Middle East," said Mr Snow. He said...