Toll rises to 44 in bomb attack in Syrian Kurdish city.
Deputy Interior Minister Mohammad Hossein Zolfaghari told Iran's state TV the apparently male attackers wore women's attire.
The twin attacks came as former prime minister Nawaz Sharif along with his daughter Maryam returned to the country to face arrest in a corruption case.
Islamic State group jihadists have claimed responsibility for twin explosions.
The blast took place during Dhamaal -- a Sufi ritual -- when hundreds of devotees were present inside the premises of the vast mausoleum of the saint.