Secretary General of the Arab League Ahmed Aboul Gheit strongly condemned the terrorist attack that took place near Moscow on Friday.
He described the attack as an act that cannot be justified under any pretext.
In a statement, Aboul Gheit expressed his deepest condolences to the Russian government and the families of the victims of the attack and also wished a speedy recovery to the injured.
Camouflage-clad gunmen opened fire with automatic weapons at concertgoers near Moscow on Friday, killing at least 60 people and injuring 145 in an attack claimed by ISIS.
In the deadliest attack in Russia since the 2004 Beslan school siege, gunmen sprayed civilians with bullets just before Soviet-era rock group "Picnic" was to perform to a full house at the 6,200-seat the Crocus City Hall just west of the capital.