For New York City, it wasn't an unusual sight: a possibly mentally ill woman pacing and mumbling to herself on an elevated subway station platform. The woman eventually took a seat on a bench Thursday night, witnesses later said. Then, without any warning or provocation, she sprang up and used both hands to shove a man into the path of an oncoming train. As police sought on Friday to locate the unidentified woman, Mayor Michael Bloomberg urged residents to keep the second fatal...
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