The United States said yesterday it considered "all options" on the table if Syria is found to have supplied Scud missiles to Hezbollah, posing a major threat to Israel. Jeffrey Feltman, the assistant secretary of state for the Middle East, said the United States would have "really, really serious concern" if Syria delivered such high-grade weapons to the Lebanese Shiite militia. "If these reports turn out to be true, we're going to have to review the full range of tools that are available for us in order to make Syria reverse what would be an incendiary, provocative action," Mr. Feltman said.