Russia on Saturday said it had arrested 11 people – including four gunmen – over the attack on a Moscow concert hall claimed by the Islamic State, as the death toll rose to 115. 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. 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 f…