Police today sealed off an alleyway leading to a popular park.
A passerby said the alleyway, close to Crane Park, was sealed off and five police cars were at the scene.
Police today said they could not confirm the nature of the incident, south of the A316, close to the Twickenham and Hounslow border.
A spokeswoman said police were investigating but the lead officer was not available to comment.
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