A senior police officer said the second bomb went off while the bomb squad was defusing it.
Four Iranian Police Officers Wounded in Zahedan Blasts
At least Four police officers were wounded in blasts close to a police station in Zahedan city in Iran on Tuesday night, Mehr news agency reported.
Explosions rocked the city, located 1,468 kilometres southeast of the capital, Tehran, at 8:30 pm local time, Sistan-and-Baluchestan provincial police chief, Brigadier General Mohammad Ghanbari told Mehr news agency.
According to Ghanbari the blast had been caused by a handmade stun grenade.
He said a bomb disposal unit was dispatched shortly afterwards to the site of the explosion, where they found a suspicious package on the street.
The bomb disposal experts then ordered local residents to evacuate. He said the second device blew up as they were trying to defuse it, slightly injuring four members of the bomb squad.
IRNA meanwhile reported that Jaish ul-Adl claimed responsibility for the attack in a statement.
The group said in a statement it had targeted a police station with “two strong bombs”, damaging a police car and a police motorcycle.
Speaking to IRNA, deputy governor of Sistan-Baluchestan Province for security affairs Mohammad Hadi Marashi said investigations are still underway by security and police forces but said such actions had no effect on security of the province.