Bird Identification: CLOSED: CLOSED: ID anyone? , 1 by kawasemi

kawasemi wrote:
Fellow bird lovers,
Need your assistance once more if you can. Took these photos of a bird of prey this morning, 12/29/14 at an elevation of around 300 meters in Fukuoka, Japan. Got within about 100 meters, but then it saw me a flew off. I couldn't give you a good estimate of it's size. Unable to get any really clear shots of it's head, but perhaps the tail, legs, and back will hopefully be enough for an ID. After checking the photos in the field, I thought the white spots would help in identification. Japanese birds of prey are notoriously difficult to approach. this one was no exception. Perhaps it is an immature? It flew of in level flight with regular wing beats. Not rapid like some falcons.

Thanks, Kawasemi