“The workers were blasting the Einali mountain to build a road,” an official in the Tabriz governor’s office told Reuters by telephone.
Iran’s semi-official Fars news agency reported earlier that an explosion shook Tabriz shortly after mid-day.
The official, who asked not to be named, said there were no casualties.
Tabriz is the capital of Iran’s Northeastern Azerbaijan province.
Iran often blames blasts in outlying provinces on foreign agents. The majority of the population in Tabriz are Azeris and speak a language closely related to Turkish. They make up about 25 percent of the population in the Islamic Republic of Iran.
