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Ammon News - Russia remanded in custody on Tuesday a Kyrgyzstan-born man suspected of involvement in Friday's mass shooting at a Moscow concert hall, and sent investigators to Tajikistan to question the families of four men charged with carrying out the attack.

Eight suspects have now been remanded in pre-trial detention since gunmen sprayed concertgoers with bullets in the deadliest attack in Russia in two decades.

Islamic State has claimed responsibility and released footage from the attack. The United States and France say intelligence suggests the group was indeed behind the attack, in which 139 people were killed and 182 wounded.

Russia has said the four suspected gunmen have confessed, but some showed signs of injuries when they appeared in court, raising concern they had been tortured.

Russia's commissioner for human rights said detention of suspects should be carried out in accordance with the law, TASS news agency reported, after videos were published showing the interrogation of the suspects. One had part of his ear cut off during questioning.

"It is absolutely unacceptable to use torture on detainees and defendants," the commissioner, Tatyana Moskalkova, was quoted as saying by TASS.

Russian authorities have said they are investigating.

The arrests have cast a spotlight on two mainly Muslim former Soviet republics in central Asia that have close ties with Moscow and depend on remittances from migrant labourers working in Russia.

Three Tajik sources told Reuters on Tuesday that Russian investigators were in Tajikistan questioning the families of the four suspected gunmen, saying their relatives had been brought to the capital Dushanbe from their home towns.

On Tuesday, Putin said he hoped prosecutors would do everything to ensure the attackers would be justly punished.

Reuters