Russia has arrested 11 people including four suspected gunmen in connection with a shooting rampage that killed at least 143 people in a concert hall near Moscow, the Kremlin said Saturday.
Militant Islamist group Islamic State claimed responsibility for Friday's attack, the deadliest in Russia for 20 years. But there were indications that Russia was pursuing a Ukrainian link, despite a statement from Ukrainian presidential adviser Mykhailo Podolyak that Kyiv had nothing to do with it.
The FSB security service said "all four terrorists" had been arrested while heading to the Ukrainian border, and that they had contacts in Ukraine. It said they were being transferred to Moscow.