By Patricia Zengerle WASHINGTON, June 16 (Reuters) - The U.S. Senate on Tuesday narrowly blocked the latest Democratic-led effort to end the Iran war until it is authorized by Congress, the ninth by Democrats since Israel and the United States began their air attacks on Iran in February. The Senate voted by 48-47 to block the resolution under the war powers law, which followed a framework agreement announced this week by the White House and Tehran for a further ceasefire and talks to end the conflict.