Sun seekers were reportedly evacuated from Kensington Gardens after a 'suspect package' was discovered in the grounds on Wednesday (July 20).
It happened near Lancaster Gate at around 1.35pm.
However, getwestlondon has learnt the item was later found to be merely a stray jacket.
David Hornby posted an images of the sealed off park from his Twitter account, and said it had reopened within 15 minutes.
Police confirmed the item discovered was non-suspicious.
The Royal Parks, which manages the gardens which are close to Kensington Palace where the Duke and Duchess of Cambridge live along with their two children, made no comment.
It is not the first time a safety first approach has been taken to the discovery of suspicious items in west London.
In May at an Uxbridge building site, 'dangerous chemicals' were dealt with by a bomb squad, but were later found to be a tin of paint .
A novelty alarm clock available on Amazon was blown up in Hounslow in June when police believed it to be a bomb.
And, earlier the same month, a controlled explosion was carried out when a package was found outside the Israeli Embassy in Kensington High Street , but this was later found to be personal belongings in a car.