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The Latest: Vietnam says Chinese vessels sank a fishing boat

  • Journalists gather outside the Peace Palace in The Hague, Netherlands, on Tuesday, July 12, 2016, ahead of a ruling by the Permanent Court of Arbitration (PCA) on the dispute between China and the Philippines over the South China Sea. China has intensified the drumbeat of its opposition to an international tribunal's ruling expected Tuesday that could threaten its expansive claims in the South China Sea. (AP Photo/Mike Corder)

    Journalists gather outside the Peace Palace in The Hague, Netherlands, on Tuesday, July 12, 2016, ahead of a ruling by the Permanent Court of Arbitration (PCA) on the dispute between China and the Philippines over the South China Sea. China has intensified the drumbeat of its opposition to an international tribunal's ruling expected Tuesday that could threaten its expansive claims in the South China Sea. (AP Photo/Mike Corder)  (The Associated Press)

  • FILE - This May 11, 2015, file photo, shows land reclamation of Mischief Reef in the Spratly Islands in the South China Sea. An international tribunal has found that there is no legal basis for China's claiming rights to much of the South China Sea. The Permanent Court of Arbitration (PCA) issued its ruling Tuesday, July 12, 2016, in The Hague in response to an arbitration case brought by the Philippines against China regarding the South China Sea, saying that any historic rights to resources that China may have had were wiped out if they are incompatible with exclusive economic zones established under a U.N. treaty. (Ritchie B. Tongo/Pool Photo via AP, File)

    FILE - This May 11, 2015, file photo, shows land reclamation of Mischief Reef in the Spratly Islands in the South China Sea. An international tribunal has found that there is no legal basis for China's claiming rights to much of the South China Sea. The Permanent Court of Arbitration (PCA) issued its ruling Tuesday, July 12, 2016, in The Hague in response to an arbitration case brought by the Philippines against China regarding the South China Sea, saying that any historic rights to resources that China may have had were wiped out if they are incompatible with exclusive economic zones established under a U.N. treaty. (Ritchie B. Tongo/Pool Photo via AP, File)  (The Associated Press)

  • A man holds up a handwritten sign in Chinese which says "South Sea belongs to China", in reference to the South China Sea, outside the Peace Palace in The Hague, Netherlands, on Tuesday, July 12, 2016, ahead of a ruling by the Permanent Court of Arbitration (PCA) on the dispute between China and the Philippines over the South China Sea. China has intensified the drumbeat of its opposition to an international tribunal's ruling expected Tuesday that could threaten its expansive claims in the South China Sea. (AP Photo/Mike Corder)

    A man holds up a handwritten sign in Chinese which says "South Sea belongs to China", in reference to the South China Sea, outside the Peace Palace in The Hague, Netherlands, on Tuesday, July 12, 2016, ahead of a ruling by the Permanent Court of Arbitration (PCA) on the dispute between China and the Philippines over the South China Sea. China has intensified the drumbeat of its opposition to an international tribunal's ruling expected Tuesday that could threaten its expansive claims in the South China Sea. (AP Photo/Mike Corder)  (The Associated Press)

The Latest on an international tribunal's ruling on the case filed by the Philippines against China's claims in the South China Sea (all times local):

4 p.m.

Vietnam has accused Chinese vessels of sinking a Vietnamese fishing boat in disputed waters as an international tribunal was to rule Tuesday on the case brought by the Philippines that challenges Beijing's claim of most of the South China Sea.

Nguyen Thanh Hung, a local fisheries executive in central province of Quang Ngai said two Chinese vessels chased and sank the Vietnamese fishing boat as it was fishing near the Paracel Islands on Saturday. The fishermen were rescued by a fellow fishing trawler some seven hours later.

The Permanent Court of Arbitration in The Hague was scheduled to issue its ruling later Tuesday.