But the Chinese Consulate could only confirm the passport details of 18 Chinese citizens, Xinhua said.
The report cited the Malaysian Maritime Enforcement Agency as saying there were 28 Chinese tourists on board.
Calls to the Chinese Consulate rang unanswered Sunday.
They are contending with strong winds and choppy waters.
Malaysia deployed search and rescue ships and helicopters after receiving a call Saturday night about the boat`s disappearance, Xinhua reported.
