Security staff bundled a man out of the Labour Party conference hall after he climbed on stage with Bill Clinton.
The man mounted the rostrum as the former US president soaked up applause following a rousing conference address which was warmly received by delegates.
He spoke to Mr Clinton before apparently producing a camera and attempting to photograph himself with the former US leader, who remained calm throughout.
However, the middle-aged man was swiftly seized by security men and bundled out of the hall.
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The already stringent security at the Blackpool conference has been bolstered by the presence of Mr Clinton's own Secret Service aides.
Local police were not initially able to comment on the incident.
PA