Iran's parliament speaker has said that an attack that killed 27 members of Iran's elite Islamic Revolutionary Guards Corps (IRGC) was "planned and carried out from inside Pakistan.”
In the remarks carried by the state-run IRNA news agency on February 17, Ali Larijani said that Pakistan should answer for its involvement in the attack.
The comments come as Iran’s Foreign Ministry summoned the Pakistani ambassador on February 17 to protest the assault, one of the deadliest attacks on Iranian security forces in years.
Islamabad condemned the bombing but has not commented on Tehran’s allegations.
The IRGC says a suicide bomber on February 13 drove an explosives-laden vehicle into a bus that was transporting troops in Sistan-Baluchistan Province.
A militant Sunni Muslim separatist group called Jaish al-Adl (Army of Justice) claimed responsibility for the attack.
Sistan-Baluchistan is a volatile area near Iran's borders with Pakistan and Afghanistan where militant groups and drug smugglers frequently operate.
The province is populated mainly by Sunni Muslim ethnic Baluchis.
Tehran has repeatedly accused the United States, Israel, and U.S. ally Saudi Arabia of backing Sunni militia groups that carry out attacks against Iranian security forces, charges those countries have denied.
The U.S. accuses Iran of sponsoring terrorism.