Death toll in Moscow concert attack rises to 115

The death toll has risen to 115 after gunmen stormed a concert hall in Moscow in a grisly attack.

Camouflaged gunmen opened fire at the packed Crocus City Hall in Moscow's northern suburb of Krasnogorsk on Friday evening ahead of a concert by Soviet-era rock band Piknik in the deadliest attack in Russia for at least a decade. 

Russia's FSB security service said some of the perpetrators had fled towards the Russia-Ukraine border, adding that the assailants had appropriate contacts in the country. 

Russia’s Investigative Committee said four of those detained were directly involved in the attack.

Russian President Vladimir Putin was yet to comment publicly on the attack and Moscow has not addressed the Islamic State's claim of responsibility, even as some lawmakers pointed to a possible Ukraine connection.