BREAKING: Russia arrests four alleged gunmen over concert hall attack

Russia has arrested 11 people, including four suspected gunmen, in connection with a shooting rampage that killed 93 people in a concert hall near Moscow, according to the Kremlin.

It said FSB security service chief Alexander Bortnikov had reported to President Vladimir Putin that those detained included "four terrorists" and the service was working to identify their accomplices.

At least 93 people were killed and a further 145 people were injured when gunmen dressed in camouflage opened fire at Crocus City Hall, a 6,200-seat theatre in the suburb of Krasnogorsk, in Moscow's west.

(Source: ABC news)