Dushanbe: Nine people have been detained by Tajikistan's state security service over their suspected contact with perpetrators of last week's attack by gunmen on a suburban Moscow concert hall, Al Jazeera reported, citing Russian state media, on Friday.

"Nine residents of the Vakhdat district were detained for contact with the persons who committed the terrorist attack at Crocus City Hall on March 22," the RIA Novosti news agency reported on Friday, citing information from an unnamed source in Tajikistan's special services, who said that Russian security forces were also involved in the operation to detain the suspects.

Tajikistan's state security service has detained nine people for suspected contact with the perpetrators of last week's attack by gunmen on a suburban Moscow concert hall that killed 144 people, Russian state media reported.

Russian officials previously said that 11 suspects had been arrested in the country, including four who allegedly carried out the attack.

Those four, identified as Tajik nationals, appeared in a Moscow court on Sunday on terrorism charges and showed signs of severe beatings. One appeared to be barely conscious during the hearing.

Russia's Investigative Committee additionally said on Thursday that it had detained another suspect in relation to the raid on Crocus City Hall on suspicion of being involved in financing the attack. It did not give further details of the suspect's identity or alleged actions, Al Jazeera reported.

A faction of ISIL has claimed responsibility for the massacre. But Russian officials, including President Vladimir Putin, have persistently claimed that Ukraine and the West had a role in the attack.

Al Jazeera reported that the detentions come at a time when Russia's investigative committee has announced it has evidence - which it has not shared with the public - about "connections between funds received in cash and cryptocurrency from Ukrainian people or nationals to the perpetrators of this attack".

Ukraine has denied involvement, and its officials claim that Moscow is pushing the allegation as a pretext to intensify its fighting in Ukraine.

The death toll from the concert hall attack has continued to rise, with the number of deaths increasing to 144 on Friday when a severely injured victim died in a hospital, according to Russian Health Minister Mikhail Murashko.

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