A Polish man has been arrested after he pretended to be a mannequin in front of a store window before stealing from a shopping centre after it closed, police in Warsaw said. "A 22-year-old with a bag in his hand froze motionless, pretending to be a mannequin in front of a shop window," police said in a statement. "In this way, he wanted to avoid being exposed by the cameras." After the shopping centre closed the man on one occasion robbed a jewellery stand, according to police. On another occasion he went into a restaurant to eat, before slipping under…