Police are "assessing a number of discarded items" in London's Kensington Gardens after a video was shared online in which a group claimed to have targeted the nearby Embassy of Israel with drones carrying dangerous substances.
The Metropolitan Police said the embassy had not been attacked and officers were investigating the source and authenticity of the footage.
The entire park is cordoned off and will be closed throughout Friday as police investigate the items and authenticity of the footage.
The embassy confirmed the site was not attacked and staff were safe, while the Met said it does "not believe there to be any increased public safety risk at this stage".
A Met Police chemical, biological, radiological and nuclear team has been seen near the park's bandstand.
