Russian President Vladimir Putin Thursday called an explosion that tore through a Saint Petersburg supermarket, wounding 13 people, "an act of terror".
This photo provided by the Information Center of the Russian National Antiterrorism Committee shows the damage inside a supermarket after an explosion, in St. Petersburg, Russia, Thursday, Dec. 28, 2017. No person or group has claimed responsibility for the attack.
Putin ordered law enforcement officers to "act decisively" in order to detain those responsible for the crime, and citizens remain on high alert in the country's second largest city.
Storage boxes at all Perekrestok supermarkets in St. Petersburg were removed following the attack.
Initial reports said that two bombs had gone off, but it became clear that there was a single blast - possibly in the third carriage of the train.
Putin said Wednesday's supermarket explosion that left at least 13 people injured was a terrorist attack
Earlier this month, Putin telephoned President Donald Trump to thank him for what the Kremlin described as a Central Intelligence Agency tip that prevented more bombings in St. Petersburg, Putin's hometown. One of the suspects recently pled guilty to recruiting terrorist operatives for the Islamic State.
In April, a suicide bombing in St. Petersburg's subway left 16 people dead and wounded more than 50.
Mr Putin was speaking at an awards ceremony in the Kremlin for Russian military servicemen and women who served in Syria.
"What would have happened if those hundreds, thousands. had come back to us, trained, armed and well-prepared?"
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