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https://www.washingtonpost.com/world/europe/major-blast-rocks-metro-station-in-st-petersburg/2017/04/03/7ff73ef2-1865-11e7-8003-f55b4c1cfae2_story.html?tid=ss_tw&utm_term=.e4c317d36132

Authorities gave no other immediate details on the investigation. Russian news agencies said a second explosive device was found that did not detonate.

[lancium]

Fluid situation The Interpreter‏ @Interpreter_Mag Information not confirmed about unexploded bomb found at Pl. Vosstaniya stop in St. Petersburg metro Also, interesting Petersburg airport went into emergency mode (full bag inspections) and now shutdown Isaac Webb‏Verified account @isaacdwebb Isaac Webb Retweeted Медиазона Pulkovo Airport in St. Petersburg operating in a state of emergency, according to LifeNews has been closed.