Russia has charged four men it says carried out the attack in a Moscow concert hall that killed at least 137 people.
According to the BBC, the four were named by Russian authorities as Dalerdzhon Mirzoyev, Saidakrami Murodali Rachabalizoda, Shamsidin Fariduni and Muhammadsobir Fayzov.
Video showed three of them being marched by masked police into Basmanny district court in the Russian capital.
The suspects were marched blindfolded into a Moscow court to face a charge of committing an act of terrorism.
The men the court identified as Mirzoyev and Rachabalizoda had black eyes and the latter’s ear was heavily bandaged – reportedly from it being partially severed during his arrest.
Mirzoyev also appeared to have a torn plastic bag wrapped around his neck.
The face of the man identified as Fariduni was badly swollen, while the man named as Fayzov appeared to lose consciousness as he was brought into court in a wheelchair wearing a thin hospital gown.
He appeared to have an eye missing, according to the Reuters news agency.
All were held in a glass-panelled booth and guarded by masked police during their time in court.
A court statement on the Telegram messaging service said Mirzoyev had “admitted his guilt in full”, while Rachabalizoda also “admitted guilt”.
The men were identified as citizens of Tajikistan, Russia’s state news agency Tass said.
All four are to be held in pre-trial detention until at least 22 May, the court added.
Four gunmen on Friday night stormed the Crocus City Hall in Krasnogorsk, a northern Moscow suburb, and began firing on some of the estimated 6,000 people who were attending a rock concert.
The attackers also set fires which engulfed the venue and caused the roof to collapse.
Russian authorities said 137 people were killed and more than 100 injured.
