US secretary of state Marco Rubio said the US is determined to cooperate fully with Japan's government and local authorities as the investigation continues .(EPA Images pic)WASHINGTON: US secretary of state Marco Rubio on Saturday offered his "sincere condolences" to his Japanese counterpart over the murder in Okinawa allegedly committed by a US Marine, and pledged US cooperation in the investigation.

A US Marine stationed on Okinawa has been arrested on suspicion of killing a 39-year-old woman at a hotel in the Japanese city of Naha and stealing her wallet.

Local media have reported the woman was choked to death and that the Marine is denying the allegations.

In his call with Japanese foreign minister Toshimitsu Motegi, Rubio "expressed sincere condolences over the death of a Japanese national in Okinawa," the State Department said in a readout.