>> A suicide bomber thought to be behind Monday's blast on the Saint Petersburgs Metro, which left 14 people dead. That's according to Russia's Interfax News Agency, quoting a law enforcement source. The chief suspect born in Kyrgyzstan, a mainly Muslim central Asian country, closely allied to Russia, the Krygyz security service said Tuesday.
Flowers laid at a makeshift shrine on Monday night, by President Vladimir Putin. He was in Russia's old Imperial capital at the time of the attack. Still no claim of responsibility, officials haven't confirmed an Islamist link, but are treating this as an act of terrorism. If it is one, Moscow's role in Syria's war will come under the spotlight, says Reuter's Russia Bureau Chief, Christian Lowe.
>> Since Russia has started using its aircraft to bomb targets in Syria and support Syrian president Bashar Assad, Islamic state has repeatedly, through its propaganda arms and its own website, issued threats to Russia and said that Russia will be made to pay.>> Putin has also taken a tough line crushing Muslim separatists within Russia.
Rebels from the North Caucasus, mainly Chechnya, have struck before many times. Moscow's metro, the target of suicide bombers in 2010. Two years ago, Islamic State said it brought down a plane carrying Russian tourists home from the Red Sea. All 224 on board perished.>> We can anticipate that the Kremlin would say, this kind of attack, if it does turn out that Islamists were behind it, that this justifies what Russia is doing in Syria where Russia says it is combating terrorism.
And they would say it justifies the crackdowns that Russia is conducting on Islamist rebellions.>> Moscow declaring three days of mourning following the attacks.