[HIGHLIGHTS] Putin could lose another ally in Russia's terror fury

Putin could lose another ally in Russia's terror fury. After the Moscow attack, Russia is interrogating four main suspects.

They are said to come from Tajikistan - pressure on Central Asian people is growing in Russia. In the city of Blagoveshchensk, a café run by a Tajik immigrant was set on fire. There were also reports of physical attacks on three Tajiks in the western Russian city of Kaluga. The Central Asian country of Kyrgyzstan has also called on its citizens not to travel to Russia.