Iranian security forces shot dead six militants in a clash in southeastern Iran, state-run Irna reported, adding that the group was linked to Israel.
The incident came a day after armed rebels killed five police officers in the region on Friday.
"One of the major terrorist plots in the eastern part of the country has been neutralised and the terrorist team responsible for it has been completely destroyed," the intelligence department of Sistan and Baluchestan said in a statement cited by Irna on Saturday.
The report claimed that the militants were not Iranian nationals and that it appeared they had received training by Israel's Mossad spy agency. It did not specify their nationality.
Two other members of the militant group were arrested, the report said.
"Based on the information obtained, the goal of this terrorist team was to attack one of the vital centres in the eastern region of the country," it added.
Iran's south-east has been the scene of sporadic clashes between security forces and armed groups, including Sunni militants and separatists who say they are fighting for greater rights and autonomy.
The crackdown on suspected Mossad agents or affiliates has intensified since the 12-day war with Israel in June. During the unprecedented war, Iran's police said it arrested 21,000 people as part of a campaign to tackle Israeli espionage.
There was no comment from Israel but Israeli intelligence officials openly bragged about how easily Iran could be infiltrated. Tehran pledged swift trials for suspects and has announced several executions for espionage.
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Who's who in Yemen conflict
Houthis: Iran-backed rebels who occupy Sanaa and run unrecognised government
Yemeni government: Exiled government in Aden led by eight-member Presidential Leadership Council
Southern Transitional Council: Faction in Yemeni government that seeks autonomy for the south
Habrish 'rebels': Tribal-backed forces feuding with STC over control of oil in government territory
Desert Warrior
Starring: Anthony Mackie, Aiysha Hart, Ben Kingsley
Director: Rupert Wyatt
Rating: 3/5
Avatar: Fire and Ash
Director: James Cameron
Starring: Sam Worthington, Sigourney Weaver, Zoe Saldana
Rating: 4.5/5
Match info
Bournemouth 1 (King 45 1')
Arsenal 2 (Lerma 30' og, Aubameyang 67')
Man of the Match: Sead Kolasinac (Arsenal)
if you go
The biog
Favourite car: Ferrari
Likes the colour: Black
Best movie: Avatar
Academic qualifications: Bachelor’s degree in media production from the Higher Colleges of Technology and diploma in production from the New York Film Academy
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Engine: twin-turbocharged 3.5-liter V6
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Brief scores:
Scotland 371-5, 50 overs (C MacLeod 140 no, K Coetzer 58, G Munsey 55)
England 365 all out, 48.5 overs (J Bairstow 105, A Hales 52; M Watt 3-55)
Result: Scotland won by six runs
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The burning issue
The internal combustion engine is facing a watershed moment – major manufacturer Volvo is to stop producing petroleum-powered vehicles by 2021 and countries in Europe, including the UK, have vowed to ban their sale before 2040. The National takes a look at the story of one of the most successful technologies of the last 100 years and how it has impacted life in the UAE.
Read part four: an affection for classic cars lives on
Read part three: the age of the electric vehicle begins
Read part one: how cars came to the UAE