Jihadists are being encouraged to bomb the All England Lawn Tennis Club (AELTC) in Wimbledon this June.
The world famous tennis tournament has been identified as one of several targets including the Derby at Epsom racecourse and Premier League football games this summer by a magazine reportedly published by Al Qaeda in the Arabian Peninsula.
The claims have been made in Inspire magazine, an online English language publication which outlines specific targets in the UK and details how to carry out devastating attacks to kill the most people.
Wimbledon Tennis Championships attracts 38,500 spectators a day, with the site also holding 1,800 staff.
An AELTC spokesperson said they work closely with the police to protect the public and this year would be no different.
The article advises would-be bombers to disguise themselves during the operation by wearing masks, and making themselves appear fat by wearing lots of clothing.
It gives advice to ‘lone wolves’ and says the important thing is to ‘target people and not buildings.’
In broken English the author states: "As for the field target for the car-bomb, you have places flooded with individuals, eg sports events in which tens of thousands attend, election campaigns, festivals and other gathering.
"When targeting high profile places, go for the entrance; you cannot get a car into most of these targets."
The article states there are many times and places to be targeted, and goes on to list football stadiums and major horse racing events as other targets.
Reacting to the news, the AELTC spokesperson said: "We have always worked very closely with police on all matters of security and public safety and this is no different."
Police have warned people to steer clear of radical Islamist publications online websites or face prosecution.
The caution comes after the article in the Spring issue of Inspire magazine.
A Metropolitan Police Service spokesperson said: "The MPS counter terrorism command is aware of the websites and appropriate steps have been put in place, including providing security advice where relevant.
"The public is reminded that viewing downloading or disseminating extremist material within the UK may constitute an offence under Section 1 and 2 of the Terrorism Act 2006.
"As part of our continued work, we regularly work with, and support, industry, the organisers of sporting events and companies overseeing crowded places with a variety of briefings and advice."