The number of those killed in the terrorist attack at the Crocus City Hall in the Moscow Region has risen to 93 people, but the death toll is expected to increase further, the Russian Investigative Committee said on Saturday.

"It has been established so far that the number of those killed stands at 93. The death toll will increase further," the committee said on Telegram as quoted by Sputnik.

This was one of the deadliest attacks in Russia in decades.

The Islamic State terrorist group claimed responsibility for the attack.

According to reports, the group took responsibility for the incident by publishing a short statement on ISIS-affiliated news agency Amaq on Telegram.

Video footage circulating on social media showed the vast complex of the concert hall was on fire following the incident.

Law enforcement officials rushed to the spot after the terror incident unfolded.

The attack occurred ahead of a performance by the Soviet-era rock group "Picnic" at the the Crocus City Hall.

The director of the show told Sputnik news agency none of the band members were injured in the incident.

US shared information

A White House National Security Council spokesperson claimed in a statement to Sputnik that the United States recently shared information with Russian authorities regarding a planned terrorist attack against Russia in accordance with its so-called duty to warn policy.