This kept happening in German cities last year as well. Just a new way to panic people and prep them for FF.
I think these are Predictive Programming.
links
https:// www.npr.org/sections/thetwo-way/2017/08/31/547486291/frankfurt-orders-70-000-to-evacuate-to-defuse-wwii-bomb
https:// www.ndtv.com/offbeat/german-man-finds-unexploded-wwii-bomb-in-backyard-it-was-an-eggplant-1771051
https:// www.theatlantic.com/international/archive/2016/05/germany-unexploded-bombs/484799/