An Iranian man has been arrested with a woman after trying to enter the Faslane naval base, home to the UK's nuclear-armed submarines.
Police Scotland said a 34-year-old man and 31-year-old woman were arrested at HM Naval Base Clyde at about 17:00 on Thursday.
The woman's nationality is unknown, but it is understood she is not Iranian.
The Royal Navy said the suspects "unsuccessfully attempted" to enter the base, near Helensburgh in Argyll and Bute.
A spokesperson added: "As the matter is subject to an ongoing investigation, we will not comment further."
It is understood that the pair did not try to force their way into the base.
They asked if they could enter but were refused permission and were arrested shortly afterwards. Police Scotland said its inquiries were ongoing.
Faslane is the home of all the Royal Navy's nuclear submarines, including the Vanguard-class ballistic missile submarines which carry Trident nuclear missiles.
The arrests come after the US and Israel launchedwide-ranging strikes on Iran, killing the country's supreme leader on 28 February.
Iran has responded by launching attacks on Israel and US-allied states in the Gulf.
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Defence secretary John Healey said the UKwas reviewing its terror threat level. It remains at "substantial" meaning an attack is "likely".
Prime Minister Sir Keir Starmer, said the UK had "stepped up protections for British bases and personnel to their highest level."
It was not clear whether he was referring only to bases in the Middle East and the Mediterranean or to all bases at home and abroad.
The Faslane base, which sits on the Gare Loch, has long beenthe focus of anti-war protestsfrom groups such as the Campaign for Nuclear Disarmament (CND).
A long-term peace camp has been based just outside the site since 1982.
The camp began as a protest against the Thatcher government's decision to purchase the Trident nuclear missile system but nearly 40 years later the camp is still there.
The community, composed of residents living in caravans and temporary structures, holds regular anti-nuclear demonstrations, vigils, and direct actions against nuclear weapons.
Faslane's four Vanguard submarines are the sole platforms for the UK's nuclear weapons and are due to be replaced by the new Dreadnought-class submarines after 2030.
It is also the home of Astute-class nuclear powered but conventionally armed attack submarines.
The UK's stock of nuclear warheads is based nearby at the Royal Naval Armaments Depot (RNAD) Coulport on nearby Loch Long.
The UK has operated continuous at-sea deterrence since 1969, with first Polaris and then Trident missiles stored on and launched from nuclear-powered submarines with the capacity to remain submerged at sea for months.