Four detained gunmen are not Russian citizens, says interior ministry

Members of the Russian Emergencies Ministry clear rubble at the Crocus City Hall concert venue after a deadly attack, outside Moscow

MOSCOW (Reuters) - The four suspected gunmen detained after a deadly attack on a concert hall near Moscow are all foreign citizens, Russia's interior ministry said on Saturday.

Russia said on Saturday it had arrested all four gunmen suspected of carrying out the shooting massacre and President Vladimir Putin pledged to track down and punish those behind the attack.

(Reporting by Reuters; Writing by Alexander Marrow; editing by Guy Faulconbridge)