A man found unresponsive in a Bromley park was rushed to hospital, where he is in a critical condition.
Ambulance services and police were called to Walden Recreation Ground shortly after 6pm yesterday.
The man received treatment at the scene, before being taken to hospital where he remains.
Police say the incident is not being treated as suspicious.
A London Ambulance Service spokesperson said: “We were called at 6:08pm yesterday (August 25) to reports of an incident on Victoria Road, Chislehurst.
“We dispatched a number of resources to the scene including medics in cars, an incident response officer and an ambulance crew.
“We also dispatched our hazardous area response team (HART).
“We treated a man at the scene and took him to hospital."
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