More suspects have been arrested over the deadly bomb attack against members of the Revolutionary Guards in Iran's southeastern city of Zahedan, the official IRNA news agency reported on Thursday.

"Some key members linked with the Jundallah terrorist group were arrested last night," said Brigardier General Mohammad Gaffari, a senior police official in Sistan-Baluchestan province.

An explosive-laden car exploded Wednesday morning as a bus, belonging to ground forces of Iran's Revolutionary Guards, passed by, killing at least 11 people.

Jundallah has claimed responsibility for the Wednesday attack, which killed 11 members of the Revolutionary Guards and injured 31 others.

Gaffari said that so far, a total of 65 suspects in addition to the three people responsible for the attack have been arrested, adding that "One of the main bombers has been killed (in the car bomb attack)."

The detainees were suspected of being linked to opposition groups and U.S. and British intelligence services, he said.

IRNA reported on Wednesday that five people were arrested on suspicion of involving in the car bomb attack in Zahedan, capital of Sistan-Baluchestan province.

Sistan-Baluchestan province borders both Afghanistan and Pakistan. Iranian security forces usually clash with local armed groups involved in drug smuggling.

Sistan-Baluchestan and its close province of Kerman have been hit by a string of attacks and kidnappings in the past years, which the Iranian authorities blamed on a Sunni group called Jundallah.

Earlier this year, four members of Iranian security forces were killed in Zahedan when armed men opened fire at their vehicle.

Source: Xinhua