All possible causes for the explosion in the St. Petersburg Metro are being considered, including those linked to terrorism, Russian President Vladimir Putin said.

“The causes of this event have not been determined yet, so it’s too early to talk about [possible causes]. The investigation will show. Certainly, we will consider all variants, common, criminal, first of all, of a terrorist nature,” he said.

The explosion happened between the Sennaya Ploshchad station and Tekhnologichesky Institute at around 2:40 pm local time, Russia’s National Anti-Terrorism Committee said.

Source: RT