A well-known Russian military blogger, Vladlen Tatarsky, was killed in an explosion at a cafe in St. Petersburg, authorities said. At least 32 people were injured in the incident, according to Russian state media. CNN's Jill Dougherty has more on Tatarsky and Daria Trepova, the suspect detained in connection with the explosion. #cnn #news #russia #stpetersburg #explosion #cafe