Deadly Explosion Strikes Metro Train In St. Petersburg, Russia
Or was it an unusually bloody protest against Putin?
Or will Putin find it handy to claim it was that?
So far, though no one has claimed it, the reigning surmise is terrorism, perhaps courtesy of ISIS.
Two suspected terrorists are "on the run," says the Daily Mail.
They include lots of photos.
Two suspected terrorists are on the run after a nail bomb planted in a St Petersburg train ripped through the carriages - killing at least 10 people and injury 50 today.
Several Russian media outlets have released the CCTV picture of the bearded suspect who was wearing a long, black top and a hat blamed for causing the carnage by detonating a bomb that was packed with shrapnel.
The terrifying incident took place on a train that was travelling between Sennaya Ploshchad and Sadovaya metro stations.
A second explosive device disguised as a fire extinguisher was found and defused in a nearby station.
Nobody has claimed responsibility for the explosion, but previous attacks on Russia have been blamed on ISIS and Chechens.
A search warrant has now been issued for two people in connection with the attack - one for planting the bomb which detonated at Sennaya Ploshchad and the other for leaving an explosive device at Ploshchad Revolutsii station.
A source said: 'Two people are being sought on suspicion of planning the blasts, one of whom is thought to have placed the explosive device in the metro wagon and the second person for leaving a bomb at the metro station Ploshchad Revolutsii.'
Dozens have been injured, including at least three children, as it was reported the man left a briefcase on a train before moving carriages moments before the deadly blast.