Moscow attack highlights: IS group says four fighters carried out attack

US Secretary of State Antony Blinken on Saturday denounced the deadly Moscow attack as a "heinous crime" and said Washington condemns "terrorism in all its forms."

"We condemn terrorism in all its forms and stand in solidarity with the people of Russia in grieving the loss of life from this horrific event," Blinken said in a statement.

Turkish President Recep Tayyip Erdogan on Saturday condemned the "heinous terrorist attack" in a Moscow concert hall that left at least 133 people dead. "We strongly condemn this heinous terrorist attack targeting innocent civilians," Erdogan told a public rally in the capital Ankara.

"Terrorism is unacceptable no matter who it comes from or who the perpetrator is."

Russian President Vladimir Putin vowed to punish those behind a "barbaric terrorist attack" on a Moscow concert hall that killed more than 130, saying Russia had arrested four gunmen who were trying to flee to Ukraine.

Polish Prime Minister Donald Tusk said Saturday that the Moscow attacks in which at least 133 people died must not become a "pretext" for increased violence and "aggression".

The Islamic State (IS) jihadist group said Saturday four of its militants carried out an attack on a concert hall in a Moscow suburb that Russian authorities said killed at least 133 people.

Islamic State released a photo of what it said were the four attackers behind a shooting rampage that killed at least 143 people in a concert hall near Moscow on Friday, the militant group's Amaq news agency said on Telegram.

Putin said additional security measures have been imposed across Russia, and claimed Ukrainian link to the attack.

Russian President Vladimir Putin on Saturday called an attack on a concert hall that killed more than 100 a "barbaric terrorist act".

In a televised address to the nation, Putin said: "I am speaking to you today in connection with the bloody, barbaric terrorist act, the victims of which were dozens of innocent, peaceful people. ... I declare 24 March a day of national mourning."

Russian President Vladimir Putin declared day of mourning on March 24 after a shooting rampage that killed 143 people in a concert hall near Moscow, the deadliest attack in Russia for 20 years.

A spokesman for Kyiv's military spy agency said Ukraine was not involved in Friday's shooting attack near Moscow and suggestions of a Ukrainian link "have nothing in common with reality."

Russia has arrested 11 people including four suspected gunmen in connection with a shooting rampage that killed at least 143 people in a concert hall near Moscow, the Kremlin said on Saturday.

Moscow attack LIVE updates: United Nations Secretary-General Antonio Guterres on Friday condemned the attack "in the strongest possible terms," spokesman Farhan Haq said in a statement.

Guterres "conveys his deep condolences to the bereaved families and the people and the Government of the Russian Federation," he added, referring to Russia by its official name.

Moscow attack LIVE updates: Rescuers will for "several days" scour through the rubble of a Moscow concert hall where gunmen shot dead dozens of people, the Moscow region's governor said Saturday.

"Rescuers are working at the site of the tragedy round the clock ... the work will continue for at least several more days," said Andrey Vorobyov in a post on Telegram.

Moscow attack LIVE updates: French President Emmanuel Macron has condemned the attack, calling it a "terrorist attack." Macron, in a statement, said he "firmly condemns this terrorist attack, claimed by the Islamic State." He also expressed solidarity with the victims of the attack.

Moscow attack LIVE updates: Italian Prime Minister Giorgia Meloni has expressed her solidarity with the victims of the attack in Russia."The horror of the massacre of innocent civilians in Moscow is unacceptable," Meloni said in a statement, expressing her "full solidarity with the affected people and the victims' families".

Moscow attack LIVE updates: The UK on Saturday condemned "in the strongest terms the deadly terrorist attack" at a concert hall in Moscow that left more than 90 people dead.

"We offer our heartfelt condolences and express our deepest sympathy to the families of the many victims," foreign minister David Cameron wrote on X (formerly Twitter), adding "nothing can ever justify such horrific violence."

Check out these news stories related to the terror attack in Russia's Moscow

Russia's FSB security service said that the perpetrators of the deadly attack on a Moscow concert hall had "contacts" in Ukraine and were trying to flee there, state news agencies reported.

"After committing the terrorist attack, the criminals intended to cross the Russian-Ukrainian border, and had appropriate contacts on the Ukrainian side," the state-run TASS news agency quoted the FSB as saying

The number of people killed in the attack on a Moscow concert hall has risen to 93, Russia's Investigative Committee which probes major crimes says.

It also warned that the toll could 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, according to AFP.

Russia news agencies report that 11 people – including all four assailants – have been arrested in connection with Friday's deadly attack on a concert hall in Moscow..

The head of the FSB security service informed Russian President Vladimir Putin "about the detention of 11 people, including all four terrorists directly involved in carrying out the attack," Russian state news agencies cited the Kremlin as saying in a statement, according to AFP.

Two of the alleged suspects in the terror attack near Moscow have been detained, Reuters reports, citing local news agency Tass.

Three children were among those killed in an attack on a concert near Moscow on Friday, the RIA news agency says, citing the regional healthcare ministry.

Here's what we know about the firing at a rock concert in a suburb of Moscow:

* At least 60 people are dead and more than 100 are wounded after a group of gunmen sprayed bullets inside a large concert hall

* Terror group Islamic State (ISIS) has claimed responsibility for the attack in a statement posted on affiliated channels on social media. Russia is yet to comment on this.

* The fate of the attackers is unknown as of now. Eyewitnesses said that the attackers were dressed in camouflage uniforms.

* President Vladimir Putin wished a speedy recovery to the wounded victims and conveyed his thanks to doctors,

* World leaders, including Prime Minister Narendra Modi, have condemned the incident. "India stands in solidarity with the government and the people of the Russian Federation in this hour of grief," PM Modi wrote on X.

*The United States said it had warned Russia about the possibility of an attack in Moscow. “Earlier this month, the US government had information about a planned terrorist attack in Moscow – potentially targeting large gatherings, to include concerts…” a spokesperson for the White House said.

Chinese President Xi Jinping has sent his "condolences" to his Russian counterpart Vladimir Putin over the attack on the concert hall in Moscow, state-run news agency Xinhua reports.

Xi "stressed that China opposes all form of terrorism, strongly condemns the terrorist attack and firmly supports the Russian government's efforts to safeguard its national security and stability", it reported.

As a sign of mourning and grief for the victims of the terrorist attack in Moscow, the Russian Embassy in India flies the national flag at half-mast.

“We express our sincere condolences to the families of those deceased and wish a speedy recovery to all those injured,” the embassy wrote on X.