All natives of the predominantly Islam nation of Tajikistan, Russia’s neighbor, the four were presented for preliminary hearings with thre of them reportedly declaring involvement in the killings.

However, visible signs of injuries due to beatings have raised serious doubts about the statements of those who pleaded guilty.

The four accused were individually taken to the court in Moscow on Sunday (March 24).

They were identified as Delerdzhon Mirzoyef, 32, a holder of a temporary immigration registration that has expired; Saidakrami Rachabalizoda, 30, who claimed his registration is lost; Shamsidin Fariduni, 26; a Tajikistan citizen employed at a factory in Podolsk, Russia; and Muhammadsober Faizov, 20, who worked as a barber in Ivanovo City, also in Russia.

All four will be placed under preventive detention while their cases are being tried in court.

It was not known whether the three who pled guilty to the crimes have also confessed being members of the Islamic State terror group that claimed responsibility for the carnage that took place as concert goers awaited the performance of the group “Picnic”.

Despite the IS claim, Russian officials remained unconvinced as some continue to point accusing fingers at Ukraine.

Russian President Vladimir Putin claimed the suspects had planned to escape into Ukraine.

On the other hand, the Ukraine government chided Putin”s insistence on putting the blame on them, saying that the Russian leader’s was clearly trying to shift blame from himself.

Two weeks earlier, the US Embassy issued a security warning to American citizens in Russia about a possible terrorist attack.

However, the Russian Embassy in Washington disclosed that it had not received any US warnings about a potential attack in Moscow.

As Russia mourned the victims, identification of majority of those killed remained slow with only 62 of the dead already claimed by their family.