Six people were found dead on Tuesday under mysterious circumstances in a hotel room at a Grand Hyatt in the heart of downtown Bangkok, police officials said.

       Two of the dead were Americans of Vietnamese descent and four were Vietnamese nationals, according to Prime Minister Srettha Thavisin. Police Lt. Gen. Thiti Saengsawang, the Metropolitan Police commissioner, said three of the dead were men, and three were women.

       Mr. Srettha told reporters that the crime scene did not show any signs of a robbery or fight. The belongings of the six people were still intact, and none of the plates or cups in the room were broken, according to General Thiti.

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