SEOUL, South Korea – North Korea has begun activating observation cameras and radars around the coastal site in the northeast, a South Korean report said Sunday, as the communist country prepares to launch a rocket in defiance of international warnings. The top part of the rocket mounted at the Musudan-ri launch pad has also been uncovered, the Yonhap news agency reported, citing an unnamed South Korean official. The report did not say whether a satellite was mounted on top. South Korea's Defense Ministry and the National Intelligence Service, the country's main spy agency, declined to confirm the report.