(CNN) A US Navy sailor and a Japanese woman were found dead -- both stabbed -- on Saturday in a bloody apartment bedroom on the Japanese island of Okinawa, police there said.

Both bodies have knife wounds, and investigators believe these were the cause of death, police said.

A minor was found unharmed in the apartment and is being taken care of by authorities, Okinawa police said.

The incident appeared to be a homicide-suicide, with the sailor having killed the woman, Japanese Deputy Foreign Minister Takeo Akiba said in a statement. Police did not immediately comment on a perpetrator or release any names.

The sailor was attached to the US 3rd Marine Division, which has a base in Okinawa. US Marine Corps leaders said they were aware of the deaths and will support the ongoing investigation.

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