Aftermath of a blast in St. Petersburg metro

The Russian national flag flies at half-mast on top of the State Hermitage museum in central Saint Petersburg on April 4, 2017 as a mark of respect for the victims of the April 3 terror attack in the Saint Petersburg metro. Russian police continue investigations after 14 people were killed and dozens injured in St Petersburg following explosions between two of the city's underground stations. The suspect is reportedly a native of Kyrgyzstan named as Akbarzhon Jalilov who obtained Russian citizenship, according to the Central Asian country's security service. Authorities in St Petersburg have declared three days of mourning.