He was last seen at home on Saturday and was due to meet a friend in Clacton. To help, call police on 101.
In a statement, a spokesman for Essex Police said: “We are appealing for help in finding Patrick Casey, 13, who is missing from the Frinton-on-Sea area.
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“Patrick was last seen at home on Saturday, March 18, at around 1pm before leaving to meet a friend in Clacton. He did not return home and there are concerns for his welfare.
“Patrick is described as being 5ft 2ins and of a slim build. He was last seen wearing a blue Nike baseball cap, a grey top and grey bottoms and was carrying an Adidas bag.
“Anyone who knows where he is or has seen him can contact Inspector Hayley Rook at Clacton police station on 101.”