A year ago, on April 3, 2017, an explosion occurred on the stretch between the St. Petersburg metro stations "Sennaya Ploschad" and "Technological Institute". 16 people died, 87 were injured. According to investigators, the explosion was carried out by a suicide bomber, a Russian citizen, an Uzbek by nationality and a native of Kyrgyzstan, associated with the Islamic State or Al-Qaeda.
On this day in St. Petersburg, President Vladimir Putin was holding talks with Belarusian President Alexander Lukashenko, and the explosion was supposed to demonstrate the ability of the Islamists to carry out a terrorist attack despite enhanced security measures.