There are many newspaper accounts available on the net via google. Plus there are untold historical accounts.
In a nutshell, after the Jap plane landed, three Japanese-Americans aided and abetted him in trying to take over the little island. Finally, a Hawaiian native cut the throat of the Jap pilot before the military arrived to end the affair. One Japanese-American went to prison long term, I forget what the other two received.
It was a very sordid affair and was a basis for the anti-Japanese feeling in the government. The FBI was involved and made an estimation that of the Japanese-Americans on the mainland, there were at least 5000 that would be traitors. At the time and under the circumstances, this was deemed unacceptable.
The newspaper accounts are best because they have not been sanitized, historical accounts have been mostly made PC.
It is a very interesting story and well worth researching, it gives one a different approach to the internment.