PA Media A heavy police presence is visible from behind a cordon 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. A large number of police officers have been seen at the park from behind a cordon and the park is to remain closed throughout Friday. 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". PA Media Specialist forensics police officers are carrying out investigations A Met Police chemical, biological, radiological and nuclear team has been seen near the park's bandstand and police divers have been spotted near the Round Pond ornamental lake.…