It was not known what caused the ship to sink and no distress call had been made, the center said.
目前还不清楚船下沉的原因，没有收到遇险信号，该中心表示。
Airline officials said they had no indication of why the plane went down - there was no distress call from the cockpit.
航空官员表示飞机失事原因不明，机舱没有求救电话。
Airline officials said they had no indication of why the plane went down - there was no distress call from the cockpit.
航空官员表示飞机失事原因不明，机舱没有求救电话。
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