The case comes at a time when public opinion in Okinawa is at odds with Tokyo for allowing the U.S. deployment of Osprey hybrid aircraft on the island despite lingering concerns about their safety.

The arrests also coincide with a sharp deterioration in Japan's relations with China over a disputed East China Sea island chain that makes it strategically important for Tokyo to reaffirm its alliance with the United States.

U.S. ambassador to Japan John Roos said in a statement that his government was extremely concerned by the incident and was committed to cooperating fully with the Japanese authorities in their investigation.

"I am also in close contact with the Commander, U.S. Forces Japan. These allegations, given their seriousness, will continue to command my full personal attention," Roos said.

The two U.S. servicemen are suspected of raping a woman early on Tuesday morning in central Okinawa, an Okinawa police spokesman said.

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