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UK counter-terrorism police said no explosive devices were found in their investigation into an alleged plot targeting RAF Fairford, a British airbase used by US forces involved in strikes on Iran, though a quantity of petrol was recovered from vehicles at the scene; the five men arrested were released on bail. US Secretary of State Marco Rubio called the incident, which he said involved a "foreign actor," a "very serious situation." UK Foreign Secretary David Miliband separately warned Iran's foreign minister that Britain would not tolerate "hostile activity" on British soil, citing threats from Iranian-linked groups against the British Jewish community.