Tokyo authorities are working on solving an unexpected New Year riddle -- whether an item of graffiti found in the city was created by the elusive artist Banksy.Tokyo Gov. Yuriko Koike indicated her excitement in a tweet Thursday on the discovery of a picture of a rat holding an umbrella and bag: "We found a picture of a lovely rat that could be a piece by Banksy. This may be a gift from him to Tokyo. It seems the rat is carrying a bag."あのバンクシーの作品かもしれないカワイイねずみの絵が都内にありました! 東京への贈り物かも? カバンを持っているようです。 pic.twitter.com/aPBVAq3GG3The pictu…READ FULL ARTICLE