A suicide attack struck a bus carrying members of Iran's Revolutionary Guard, killing as many as 30 personnel of the elite corps.
The bus was travelling on a highway near the town of Chanali in Iran's southeastern Sistan-Baluchistan province, the state-run Fars news agency reported citing officials it didn't name.
Ten others on board the bus were wounded, the agency said. It described the passengers as "shift personnel," but didn't provide any details of their rank.
There was no immediate word on who might have carried out the attack.
In September last year, Isis militants and an Arab group claimed responsibility for a deadly assault on a military parade, also in the country's south, that killed and wounded dozens of people, including members of the Guards.
