RFE/RL's Tajik Service reports that dozens of party members and supporters are gathering at Nuri's home to pay tribute.
Nuri reportedly traveled several times to Germany for treatment of what was believed to be cancer.
Nuri was one of the leaders of the armed opposition during Tajikistan's civil war in 1992-97.
He joined President Imomali Rakhmonov's coalition government after the 1997 peace agreement, chairing its national reconciliation commission.
Nuri was born in March 1947 in the Komsomolabad district of Soviet Tajikistan.
MORE: Coverage in Tajik from RFE/RL's Tajik Service.