“We will never forgive you,” protesters chanted outside Kadena’s barbed wire fence on Friday, according to the Asahi Shimbun. “U.S. bases should get out.”

Japanese leaders reacted with outrage after a U.S. Marine veteran was arrested Thursday in connection with the death of a Japanese woman near a U.S. air base on the island of Okinawa.

Kenneth Franklin Gadson, a 32-year-old civilian contractor at Kadena Air Base, admitted to strangling the woman, his defense attorney told Stars and Stripes — though the attorney questioned the condition under the which the admission was made. Rina Shimabukuro had been missing since last month.

The 20-year-old’s body was discovered in a wooded location Thursday after Gadson told investigators where to look, according to the Associated Press.

The incident comes at a crucial juncture for the two countries. President Obama is scheduled to visit Japan next week for a Group of Seven summit, after which he is scheduled to visit Hiroshima to remember the atomic bombings of Hiroshima and Nagasaki by the United States during World War II. Obama is also expected to highlight his message of nuclear nonproliferation and to discuss future relations between the two nations.

Those relations have been tested, however, by crimes committed by U.S. military personnel on or near American bases, including Kadena. The base is home to more than half of the 47,000 American troops based in Japan.

Many Japanese, including Okinawa’s governor, Takeshi Onaga, want the American bases gone altogether.