Officers are concerned for the welfare of a missing 26-year-old man from Colchester.
Kieran Lock was reported missing shortly after 10am this morning (July 23).
He was last known to be wearing a black top, a jacket with white stripes and blue jeans.
Mr Lock has been described by Essex Police as having light brown hair and is about 5ft 8ins tall.
A spokesman for Essex Police said: "If you see Kieran or know where he is, please call us on 101 immediately.
"We are concerned for his welfare."
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