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Russian authorities detained 11 people after gunmen stormed a concert hall in Moscow in a grisly attack that left at least 115 people dead, AP reported on Saturday, citing state media.

Russia’s Investigative Committee said four of those detained were directly involved in the attack that left the sprawling shopping mall and music venue smoldering with a collapsed roof.

Russian agencies appeared to suggest the attack was linked to Ukraine even though the Islamic State group claimed responsibility in a statement. A U.S. intelligence official told The Associated Press that U.S. agencies had confirmed that that group was responsible for the attack.

The four suspects were stopped in the Bryansk region of western Russia, “not far from the border with Ukraine,” Russia’s Investigative Committee said. They planned to cross the border into Ukraine and “had contacts” there, state news agency Tass said, citing Russia’s FSB. The head of the FSB briefed President Vladimir Putin on the arrests on Saturday, according to Tass.