Smoke grenades, loud hailers and paint have been found by police in a car and a van close to where G7 world leaders are meeting in Cornwall.
Seven people have been arrested after the items were found in a traffic stop about 5pm on Thursday, police said.
Devon and Cornwall Police confirmed that officers carried out the traffic stop in Loggans Rd, Hayle – just seven miles from the Carbis Bay Hotel where Joe Biden and Boris Johnson and other world leaders will meet to discuss environmental issues.
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.
A force spokesman said all seven remain in police custody.
He added: “The items and the vehicles have been seized by police as part of ongoing inquiries in relation to this matter.
“We continue to support the facilitation of safe and legal protest but criminal activity and public disorder will not be tolerated.”
