I know of one example and it was actually one of the reasons the internment camps were set up in the first place. I will say that despite this incident, the internment camps were almost entirely due to racism, and that they were set up even after intelligence officials determined there was no threat by Japanese Americans.

The Ni'ihau Incident started on December 7, 1941, the day of the Attack on Pearl Harbor. A pilot named Shigenori Nishikaichi was shot down during the attack and crashed his Mitsubishi Zero on the small island of Ni'ihau. The Japanese Navy mistakenly believed the island was uninhabited, and designated it a landing zone for damaged aircraft, telling pilots they could be rescued by Submarine if they land there. In actuality the island was owned by a American Aylmer Robinson and over 100 Native Hawaiians lived on it, as well as 3 Japanese-Americans. Nishikaichi crash landed in a field near Hawila Kaleohano, who was unaware of the attack, but still acted quickly to confiscate his weapon and papers while he was stunned. The pilot was moved to a house where he was taken care of, but the Hawaiians could not understand his words, so they sent for Japanese-American Ishimatsu Shintani to translate. The two had a brief conversation before Shintani left without saying anything.

The Hawaiians then reached out to Yoshio Harada and his wife Irene Harada, both second generation Japanese-Americans. After a conversation with the pilot, the Harada's agreed to assist him in retrieving his papers from Kaleohano and help him escape. That evening, the Hawaiians learned of the attack via radio and confronted Nishikaichi, and the Harada's having previously withheld information, translated information of the attack this time. Robinson, who lived on Kauaʻi, was expected for his weekly visit the next day, and it was agreed that they would send Nishikaichi back with Robinson to be turned over to authorities. When Robinson did not arrive for several days, the result of an military ban on all non-military boat traffic, the Hawaiians agreed to let Nishikaichi stay with the Harada's, but under guard. It was during this period that Nishikaichi and the Harada's began scheming together.

While Shintani attempted to bribe Kaleohano for the papers, Y. Harada and Nishikaichi attacked and disabled the guard while I. Harada played music to mask the sound of the attack. The guard was locked in a shed where a Nishikaichi's Pistol and a Shotgun were retrieved. Shinanti had been unsuccessful at bribing Kaleohano, so the pair departed seeking to take the papers by force. Kaleohano was in his outhouse when he saw Y. Harada and Nishikaichi arrive and begin searching, and fled when they were distracted. He was fired at, but was not hit. Kaleohano ran to the nearby village to warn everyone about what was happening, his story shocked the locals who had known the Harada's and could not believe they would turn on the Hawaiians so readily. The women and children fled to safety, and Kaleohano gave the papers to a relative to hide, while he and others entered a Life Boat and paddled off the island seeking help from Robinson on Kauaʻi (not aware of the military ban on boat traffic).

Meanwhile Nishikaichi and Y. Harada returned to the Zero to contact the Japanese Navy, without success. They dismounted one of the Machine Guns and returned to Kaleohano's house, which they then set on fire. The group then captured resident Kaahakila "Kalima" Kalimahuluhulu, who feigned allegiance and agreed to help them search for Kaleohano. Kalima instead met with his friend Benehakaka "Ben" Kanahele and the pair conspired to steal the Machine Gun and Ammunition, but by the next morning Ben and his wife Kealoha "Ella" Kanahele had been captured. Ella was made a hostage and Ben was forced to search for Kaleohano, but Ben knew Kaleohano had already left the island and had was only pretending to search. After worrying about his wife, he returned, and was confronted by an angry Nishikaichi. Ben was told that if Kaleohano was not found, he, his wife, and everyone in the village would be killed.

Taking advantage of the fatigued group, Ben and Ella lunged at them in an attempt to catch them off guard and overpower them. Nishikaichi took his pistol and shot Ben 3 times, but Ben slammed him into a wall and Ella bashed him with a rock, then Ben slit his throat with a knife he had concealed. Yoshio Harada then took the shotgun and committed suicide. Ella disposed of the weapons and ran off seeking help, and Ben was taken to a hospital (he would survive). The next day Kaleohano, Robertson, and the other Hawaiians returned to Ni'ihau with a group of US Military Officials. Irene Harada and Ishimatsu Shintani were arrested, Irene was sent to prison for 3 years and Shintani was sent to an internment camp for the remainder of the war.