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Iran has arrested three suspects who Tehran says were involved in a suicide bomb attack on the Revolutionary Guards last week.

Iran had previously blamed Pakistan, Saudi Arabia, the UAE and others for the attack which killed 27.

The Revolutionary Guards said on Monday three "terrorists" who had "produced, guided and supported" the vehicle used in the attack were arrested in hideouts in Saravan and Khash.

Weapons, ammunition, 150 kg (330 pounds) of explosives and 600 kg (1333 pounds) of explosive materials were also reportedly confiscated at the time of the arrests.

The bombing killed 27 members of Iran's Revolutionary Guards travelling on a bus in the volatile province of Sistan-Balochistan which borders Pakistan.

The attack was claimed by Jaish al-Adl [Army of Justice], a jihadist group based in the province.

Revolutionary Guards commander Major General Mohammad Ali Jafari accused Pakistan's army and intelligence agency of sheltering the group.

"If [the Pakistan government] does not punish them, we will retaliate against this anti-revolutionary force, and whatever Pakistan sees will be the consequence of its support for them," he warned.

The general also lashed out at the "support that the region's reactionary states Saudi Arabia and the Emiratis" give for Israeli and American "conspiracies".

Iran has provided Pakistani officials with "information on the terrorist groups' hidden and semi-hidden training centres", army chief-of-staff Mohammad Bagheri told Tasnim news agency.

The foreign ministry summoned the Pakistani ambassador in Tehran on Sunday and urged Islamabad to "seriously confront... the terrorist groups active on its border" with Iran.