MOSCOW, August 7 (RAPSI) – The Moscow City Court has upheld extension of detention of four defendants in a criminal case over terror attack in St. Petersburg metro in April 2017, the press-service of the court has told RAPSI.

The court has dismissed appeals filed by Akram Azimov, Shokhista Karimova, Seyfull Khakimov and Makhamadyusuf Mirzaalimov.

On August 2, the Investigative Committee stated that the law enforcement completed preliminary investigation into the St. Petersburg metro terror attack case.

On April 3, 2017, an unknown device exploded in a train between St. Petersburg metro stations Technological Institute and Sennaya Ploshchad. According to law enforcement authorities, 16 people died in the blast including a suicide bomber, over 50 were wounded. 112 persons were acknowledged as victims in the criminal case.

Investigators believe that an organization with a goal of spreading terrorist activity, including attacks on Russia and its citizens, was founded in Syria. According to investigators, the suicide bomber Akbarzhon Dzhalilov manufactured two explosives and brought them to the St. Petersburg metro.

One of the bombs that Dzhalilov kept to himself exploded around 2:40 PM Moscow time between St. Petersburg metro stations Technological Institute and Sennaya Ploshchad. The second bomb located at Ploshchad Vosstaniya station failed to detonate due to its malfunction and was subsequently found and disarmed.