Moscow attack: Unidentified gunmen attacks and kills people at Crocus City Hall

Based on video footage that the BBC verified, the attack in Krasnogorsk's North-West district was carried out by at least four people wearing camouflage gear. 

During the scheduled rock concert at Crocus City Hall, the attackers broke through the doors of the foyer and entered the theater. Other areas of the building were eventually destroyed by the fire as it spread throughout them. Additionally, some of the roof was damaged.

Officials from the Russian Ministry of Foreign Affairs have called the incident a "terrorist attack" and expressed concern for the victims' safety, including children. An unconfirmed online statement claimed that the attack was carried out by the terrorist organization Islamic State.

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The BBC's American partner, CBS, was notified by US officials that they had intelligence proving the Islamic State had planned an attack on Russia. Special teams are actively searching the area in an attempt to locate and apprehend the criminals, according to the Russian National Guard. Senior Russian officials visited Krasnogorsk as well.

The US Embassy in Moscow warned US citizens not to attend such rallies, saying it was looking for indications that "extremists have imminent plans to target large gatherings in Moscow." Since the alert was sent, two weeks have gone by. It revised its alert on Friday night, this time advising US citizens to stay away from the attack scene.

Around 6,000 Russians were watching the rock group Picnic perform at the Crocus City Hall shopping and entertainment center. An eyewitness claims that the altercation began just minutes before the band was scheduled to perform. Picnic's band members all made it out alive. One of the guards reported that an armed attacker broke into the foyer and began shooting at the security team who were stationed at the main entrance.

Another witness claimed that at the time of the incident, minors were inside the building competing in ballroom dancing. Numerous ambulances were dispatched immediately to the accident scene and remained outside the Krasnogorsk facility for some time.