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A man threatened to jump into the River Thames near Dartford last night.
An RNLI crew from Gravesend's lifeboat station was called at about 12.30am.
But before they arrived, police were on the scene and took the man away.
Helmsman Jason Carroll said: "Someone was threatening to enter the river in the Dartford area. They were by the shore side.
"We were launched to go and assist the police. We set out but soon after the police arrived and we turned back."