I knew someone who was only eleven years old when this happened. She a few blocks from Pearl. At the time of the attack her dad hid her in a dresser drawer, she's tiny, because all expected an invasion.

She told me some of the rumors, main one being a lot of the Japan pilots were educated at Univ. of Washington in Seattle.
My parents said that some Japanese planted mustard in the shape of arrows pointing to Boeing plant so they could bomb it. Just rumors. Strange how some things linger. But this and other things is what brought on the hysteria leading the govt. to put people in internment camps.