Julio Acevedo, the man wanted by police in New York in connection with a hit-and-run accident that killed an expectant couple, told New York's Daily News he was fleeing a gunman who was trying to shoot at him.
The couple's baby was delivered prematurely after the crash on Sunday, but later died.
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The launch was made in defiance of United Nations sanctions barring North Korea from using ballistic missile technology.
David Cameron has raised concerns after figures showed 100 babies spent time living behind bars last year.
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