NEW YORK -- An underground steam explosion tore through a Manhattan street near Grand Central Terminal on Wednesday, sending edgy residents running for cover amid a plume of steam and flying rubble, and causing brief panic about another terror attack. The explosion was not terrorism. "There is no reason to believe whatsoever that this is anything other than a failure of our infrastructure,'' Mayor Michael Bloomberg said at a news conference at the scene of the blast. Sixteen people were taken to Bellevue Hospital, including the person who died, said spokesman Stephen Bohlen. He said two seriously injured patients were...