An attacker exploded the bomb outside police headquarters in the port city of Chabahar, located in Sistan and Baluchestan province on the border with Pakistan.
The blast injured ten officers and 32 civilians, according to a senior health official quoted by the Iranian news agency Isna. He said many of those wounded had soon been discharged.
WATCH Plumes of Smoke Rise Over Iranian City of Chabahar After Blast
According to Iranian Foreign Minister Mohammad Javad Zarif, crimes perpetrated by what he called "foreign-backed terrorists" would not go unpunished.
READ MORE: At Least Two Dead Amid Car Blast, Shooting in Southern Iranian Port of Chabahar