Chilling moment coldblooded assassin executes victim with gunshots to the head in front of horrified passengers in packed German train station

This is the shocking moment a cold-blooded assassin executes his victim with gunshots to the head in front of horrified passengers at a packed German train station.

CCTV footage shows the suspect, 54, approaching the 27-year-old man from behind at the busy Frankfurt Central Station, in the German…