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A Japanese man is questioned by Okinawa police on Sunday, Oct. 22, 2017, after standing outside Kadena Air Base's main gate dressed in black while holding what appeared to be an Islamic State banner.

A Japanese man is questioned by Okinawa police on Sunday, Oct. 22, 2017, after standing outside Kadena Air Base's main gate dressed in black while holding what appeared to be an Islamic State banner. (Courtesy of Facebook)

A Japanese man was questioned by Okinawa police on Sunday, Oct. 22, 2017, after standing outside Kadena Air Base's main gate dressed in black while holding what appeared to be an Islamic State banner.

A Japanese man was questioned by Okinawa police on Sunday, Oct. 22, 2017, after standing outside Kadena Air Base's main gate dressed in black while holding what appeared to be an Islamic State banner. (Courtesy of Reddit)

CAMP FOSTER, Okinawa — A Japanese man received a “stern warning” from police after dressing up in an all-black outfit and holding what appeared to be an Islamic State banner outside Kadena Air Base over the weekend.

Okinawa police said they were called to the scene on Sunday by Kadena officials after the man, who was wearing a black jumpsuit and mask, was spotted with the banner near Gate 1.

The man was asked to leave the area after receiving a “stern warning that his actions could lead to trouble,” police said. He left without incident.

Okinawa police would not identify the man and declined to offer further details. Kadena officials did not respond to a request for comment on Tuesday.

Japan’s Sankei newspaper reported Monday that the man donned the attire as a Halloween prank and has no ties to the Islamic State. The banner reportedly said, “We love President Trump.”

Donald Trump is scheduled to visit the Tokyo area Nov. 5-7 for his first visit to Japan as commander in chief.

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Matthew M. Burke has been reporting from Grafenwoehr, Germany, for Stars and Stripes since 2024. The Massachusetts native and UMass Amherst alumnus previously covered Okinawa, Sasebo Naval Base and Marine Corps Air Station Iwakuni, Japan, for the news organization. His work has also appeared in the Boston Globe, Cape Cod Times and other publications.

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