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The Islamic State group has claimed responsibility for a gun attack at a rock concert in Moscow on Friday, killing at least 93 people, wounding 100, and setting off an inferno in the theatre.

Attackers dressed in camouflage uniforms entered the building, opened fire and threw a grenade or incendiary bomb, according to a journalist for the RIA Novosti news agency at the scene.

Russia's Investigative Committee which probes major crimes said in a statement on Saturday that the death toll was expected to rise.

"At the moment, it has been established that 93 people are dead. The death toll is expected to rise," it said in a statement published on Telegram.

Fire quickly spread through the Crocus City concert hall in the Krasnogorsk suburb in the north of the Russian capital, which can hold several thousand people and has hosted top international artists.

Authorities said a "terrorist" investigation had been started and President Vladimir Putin was receiving "constant" updates, his spokesman Dmitry Peskov told Russian news agencies.

A manhunt has started for the perpetrators who are still at large.

IS claimed responsibility for the attack via the group's Telegram channel.

"Islamic State fighters attacked a large gathering of Christians in the city of Krasnogorsk on the outskirts of the Russian capital, Moscow, killing and wounding hundreds and causing great destruction to the place before they withdrew to their bases safely," the group said in the statement, according to The Guardian.

Russia authorities say they have thwarted a number of IS plots in recent years.

Alexei, a music producer visiting the concert, told AFP he heard "several machine gun bursts and a terrible female scream. Then a lot of screams. Just three or four bursts and then there were a few more".

"Then white smoke started to billow," he said. There was a "terrible crush" as people tried to escape and people "were climbing on their heads to get out", he added.

Telegram news channels Baza and Mash, which are close to security forces, showed video images of flames and black smoke pouring from the hall.

Other images showed two men walking through the hall with at least one person left on the ground near the entrance. Concert-goers were also seen hiding behind seats or trying to escape.

Moscow mayor Sergei Sobyanin cancelled all public events in the city for the weekend.

Security services quoted by Interfax said between two and five people "wearing tactical uniforms and carrying automatic weapons" opened fire on guards at the entrance and then started shooting at the audience.

"People who were in the hall were led on the ground to protect themselves from the shooting for 15 or 20 minutes," the RIA Novosti journalist was quoted as saying.

People started crawling out when it was safe, the journalist reported.

About 100 people escaped through the theatre basement while others were sheltering on the roof, the emergency services ministry said on its Telegram channel.

But about one third of the complex was ablaze, TASS news agency reported.

Russia's foreign ministry spokeswoman Maria Zakharova said it had been a "bloody terrorist attack".

"The whole international community must condemn this odious crime," she said on Telegram.

The US presidency called the attack "terrible" but said there was no immediate sign of any link to the conflict in Ukraine.

Ukraine's presidency said Kyiv had "nothing to do" with the attack, while its military intelligence called the incident a Russian "provocation" and charged that Moscow special services were behind it.

The Freedom of Russia Legion, a pro-Ukrainian militia responsible for attacks on Russia's border regions, also denied any role.

❗️ Official statement of the Liberty of Russia Legion.

We blame the terrorist regime of Putin for the tragedy in Moscow today. We have already encountered such manifestations of the Kremlin dictatorship since Putin's early days in power and are not surprised by another bloody…

— "Liberty of Russia" Legion (@legion_svoboda)

Former Russian president Dmitry Medvedev vowed on Telegram that Ukraine's top officials "must be found and ruthlessly destroyed as terrorists" if they were linked to the attack.

"I offer my condolences to the families of the dead," said Moscow's mayor as a major security operation was launched around the theatre and nearby shopping mall.

The European Union said it was "shocked" and "appalled" by the attack, while France condemned "odious acts".

TASS said that SOBR, special police forces and the OMON anti-riot squad had been sent to the Crocus hall.

It added that all the members of the rock band had been evacuated safely.

Orthodox church leader Patriarch Kirill was "praying for peace for the souls of the dead," said his spokesman Vladimir Legoyda.

Moscow and other Russian cities have been the targets of previous attacks by Islamist groups but there have also been incidents without any clear political motive.

Earlier this month, the warned "extremists have imminent plans to target large gatherings in Moscow", including concerts.

In 2002, Chechen separatist fighters took 912 people hostage in a Moscow theatre, the Dubrovka, demanding the withdrawal of Russian troops from the region.

Special forces attacked the theatre to end the hostage taking and 130 people were killed, nearly all suffocated by a gas used by security forces to knock out the gunmen.

Russia launched a military intervention in Ukraine in February 2022 and it has been the target of attacks along the border by anti-Kremlin forces.