Security forces have stepped up efforts to crack down on suspected militants and have arrested nearly 50 people so far.
Separately, the head of the judiciary in Fars province said seven people were detained in the southern Larestan area for possible ties to Islamic State, Iran's ISNA news agency reported on Saturday.
Iran's intelligence minister said the mastermind behind Wednesday's attacks in Tehran was killed by security forces on Saturday.
The official IRNA news agency on Sunday quotes Intelligence Minister Mahmoud Alavi as saying the suspect left Iran for a neighbouring country following the attacks but "was sent to hell" by Iranian intelligence agents and " fellow intelligence services".
He seemed to be pointing at comments last month by the Saudi deputy crown prince Mohammed bin Salman that any struggle for influence between Riyadh and Tehran would take place "inside Iran, not in Saudi Arabia".
Boris Johnson stresses loyalty to UK PM May in leaked text - ITV
May said Barwell would help her "reflect on the election and why it did not deliver the result I hoped for". The arrangement with the DUP will make governing easier, but it makes some Conservatives uneasy.
Iran has arrested nearly 50 people in connection with a twin attack on Tehran that killed 17 people last week, officials said, as security forces stepped up efforts to crack down on suspected militants.
"We possess documents and information showing the direct supports by the United States imperialism for this highly disgusting stream [IS] in the region which has destroyed the Islamic countries and created a wave of massacres and clashes", Fars news agency quoted Izadi as saying.
Abbasi said the attacks were unprecedented since the killing of Iranian lawmakers in 1980s.
"The terrorist attacks indicated the terrorist groups have failed to achieve their main goal and targeted the parliament and Imam Khomeini Mausoleum, finally resorting to martyring the innocent people and the staff at the parliament", Larijani added.
The Islamic State claimed responsibility of the two attacks - a suicide bomb and gun assault - on the Iranian parliament and the mausoleum of the founder of the Islamic Republic.
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