The South's Yonhap news agency said the vessel crossed the disputed maritime border on Thursday, but retreated when issued with a verbal warning.

南韩联合新闻通讯社报道称这艘舰船于星期四越过有争议的海洋边界，但在收到韩方的口头警告之后撤离。

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On Wednesday, pirates hijacked a Turkish-flagged ship carrying 4, 500 tons of chemicals off Yemen's coast, a Turkish news agency reported, citing the Turkish Maritime Agency.

CNN: Report: Pirates holding Chinese ship, crew of 24