What we know about the shooting at a concert venue near Moscow

Russia was rocked by one of the deadliest attacks it witnessed in decades on Friday night on the outskirts of Moscow. Over 130 people have been killed and several wounded in the terror attack at the Crocus City Hall. (Photo/Agencies)

The men, armed with Kalashnikov automatic weapons, arrived at the Crocus City Hall at around 7:40 p.m. (1640 GMT) in a minivan. Russian media said there were up to five men. (Photo/Agencies)

They began shooting civilians at point-blank range. They shot people through the glass doors near the entrance turnstiles to the venue, witnesses said, then moved on towards the concert hall itself. (Photo/Agencies)

The attackers were shown on videos from the scene methodically shooting at concertgoers as people rushed for the exits. The men then set fire to the concert hall, pouring a liquid on the curtains and chairs before igniting it. (Photo/Agencies)

Russia's top state investigative agency says the death toll in the Moscow concert hall attack has risen to 133, and the death toll is expected to rise with searches through the rubble due to last for several days. (Photo/Agencies)

Islamic State, the militant group that once sought control over swathes of Iraq and Syria, claimed responsibility for the attack, the group's Amaq agency said on Telegram. (Photo/Agencies)

The Kremlin said 11 people, including the four assailants, had been arrested. Russia's FSB security service said some of the perpetrators had fled towards the Russia-Ukraine border, adding that the assailants had "appropriate contacts" in the country. (Photo/Agencies)

The US embassy had said two weeks before the attack that there was a risk of "extremists" targeting mass gatherings in Moscow, including concerts."If the United States had reliable information on this, it should have immediately transmitted it," said Russian foreign ministry spokeswoman Maria Zakharova, calling Friday's attack a "monstrous crime". (Photo/Agencies)