Seven people have been arrested after two vehicles travelling near the G7 summit were found to contain paint, smoke grenades and loud hailers, police said.
Devon and Cornwall Police confirmed that officers carried out a vehicle stop on a car and a van near Loggans Road in Hayle, about seven miles from the Carbis Bay Hotel.
This comes amid warnings from organisers that disruptive and "annoying" protests will take place as G7 leaders gather for a summit in Cornwall to discuss the Covid-19 pandemic and climate change.
Oxfam activists with 'Big Heads' caricatures of U.S. President Joe Biden and France's President Emmanuel Macron pretend to fight over a Covid-19 vaccine with other G7 leaders, during a protest at a beach near Falmouth
Credit: PETER NICHOLLS/REUTERS
Police have closed off roads and coastal paths to Carbis Bay, the small seaside resort which is hosting the event, erecting steel fences and putting other restrictions in place.
An extra 5,000 officers have been drafted in to help the operation with about 6,500 officers and staff involved altogether, Devon and Cornwall Police said.
Giant Sand Drawing Urges G7 leaders to Waive the Covid Vaccine Patents, organised by global campaign group Avaaz
Members of the environmental group Sea Rebellion perform on the Town Beach in St Ives, Cornwall as the G7 summit starts
Credit: Marcin Nowak/LNP
The force said that the two vehicles were stopped at around 5pm on Thursday.
A 30-year-old man from London, a 21-year-old woman from Wales, and a 20-year-old man from Bournemouth were arrested on suspicion of possession of an article with intent to commit criminal damage.
Two men from London aged 25 and 27, a 45-year-old woman from London and a 26-year-old woman from Epsom were arrested on suspicion of conspiracy to commit public nuisance.
They all remain in police custody at this time, the force said, adding that the items and the vehicles have been seized as part of ongoing enquiries in relation to this matter.
In a statement Devon and Cornwall Police said: "We continue to support the facilitation of safe and legal protest but criminal activity and public disorder will not be tolerated."