President Vladimir Putin has vowed to punish all those responsible for the assault, which killed 137 people and injured 182 others.
Over 100 individuals remained in the hospital, some in bad condition. On Sunday evening, video footage showed a somber-looking Putin lighting a candle at a church outside his Moscow apartment to remember those who perished.
Earlier on Sunday, fans left flowers outside Crocus City arena, a 6,200-seat performance arena outside Moscow, where four armed men stormed in just before Soviet-era rock trio Picnic was about to perform their classic "Afraid of Nothing." The guys shot their automatic guns in short bursts at people, who collapsed screaming.
The Islamic State has claimed responsibility for the incident. Still, Putin has not publicly addressed the Islamist militant group about the assailants, whom he claims were attempting to flee to Ukraine. He stated that those on "the Ukrainian side" were prepared to transport the shooters across the border.
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On Sunday, Moscow's Basmanny district court accused four defendants of terrorism in connection with the incident, naming them as Dalerdzhon Mirzoyev and Saidakrami Rachabalizoda, Shamsidin Fariduni, and Muhammadsobir Fayzov.
It stated that the males, who were identified by Russian media as Tajik residents residing in Russia, will be kept in pre-trial prison until May 22. The report added that three of the four had pled guilty to all counts.
The White House stated that the US administration provided intelligence to Russia early this month about a potential assault in Moscow and issued a public alert to Americans in Russia on March 7. It asserted that the Islamic State was solely responsible for the attack.
