Gunnersbury Park has been closed because of fears over safety after a group of travellers began camping out over the weekend. Hounslow Council was told by police to close the area.
In a short statement the council said: "Following the advice of local police, we are closing Gunnersbury Park in the interests of public safety. We have not made this decision lightly, and will reopen the park as soon as possible."
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A man reportedly armed with several knives has been arrested in Whitehall on suspicion of planning a terror attack, police have said.
Metropolitan Police officer, Tom Harrison, has been crawling the course since the race began on Sunday morning.
The Old Bailey heard how Syed tried to get weapons online, including a bomb vest, and trawled the web to find a busy area launch an attack.