In the evening 50 people have been evacuated from a St.Petersburg supermarket after an explosion (18:55 local time, when the maximum of clients were shopping). 10 among them with injures delivered to hospitals, two in critical condition, according to city media. https://twitter.com/fontanka_news/status/946073221526425601 “The investigators are exploring all versions. An improvised explosive device stuffed with shrapnel…