In this Monday, May 22, 2017 photo, South Korean army's K-55 self-propelled howitzer fires during the annual exercise in Paju, near the border with North Korea, South Korea. South Korea's military said Tuesday, May 23, 2017, it fired warning shots at an unidentified object flying south from rival North Korea. (Lim Byung-shick/Yonhap via AP)
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