The man suspected of killing 11 people by bombing a St Petersburg train is a native of Kyrgyzstan who obtained Russian citizenship, the Central Asian country’s security service says, the BBC reports.
At least 45 people were injured in the explosion between two underground stations on Monday afternoon.
The Kyrgyz security service named the bomber as Akbarzhon Jalilov, who was born in Osh in 1995.
There are conflicting reports as to whether he was a suicide bomber.
Authorities in St Petersburg have declared three days of mourning.
Kyrgyz state media said the country’s security service was “maintaining contact with the Russian secret service for further investigation”.
Russian President Vladimir Putin, who was in St Petersburg – his home city – when the blast occurred, visited the scene on Monday evening and laid flowers at a makeshift shrine.
Russian investigators have given few details. No group has said it was responsible.