Russia has
detained 11 people, including the four gunmen
suspected of carrying out the Friday night attack at a crowded concert hall in a Moscow suburb, the head of the country's Federal Security Service (FSB) said. to the president, Vladimir Putin.
The Russian Investigative Committee reported this morning that
at least 115 people have died
after more bodies were found in the rubble.
Men in camouflage broke into the concert hall, shot and set fire to the crowded venue.
The number of deaths is expected to increase.
The terrorist group Islamic State (IS) has claimed responsibility for the attack, but has not provided evidence.
US officials confirmed to NBC News that they had been gathering information for months about the possibility that the group organized an attack that resulted in fatalities in Russia, although a definitive assessment had not yet been made about who was responsible for the attack.
US Embassy officials issued a warning earlier this month urging people to stay away from large gatherings.
[These are some of the images of the attack in Moscow that leaves at least 40 dead]
The Russian Culture Ministry canceled public events across the country, and the Moscow metro has beefed up security with police patrols, passenger inspections and a video analysis system that searches a database of suspects' faces. searched.
The attack was carried out with automatic weapons and "a flammable liquid," according to the Russian Investigative Committee.
Firefighters evacuated people from the building's basement and roof, according to emergency officials.
A popular rock group was scheduled to give a sold-out concert at the venue, which has a maximum capacity of more than 9,000 people.
With information from
NBC News