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Nobody who watched it happen would have had a happy meal.

But police say unless any new leads emerge, the mystery over who had a wee over McDonald’s’ counter will never be solved.

CCTV stills were released in a last-ditch bid to name and shame the unknown tinkler.

Onlookers tucking into their Big Macs and Quarter Pounders were said to be horrified after the man carried out the lewd act in front of kids.

But Cleveland Police say the case is now “closed”.

The unpleasant act took place at around 4.40pm on Saturday August 20 at Middlesbrough’s Linthorpe Road branch.

The suspect was with another bloke when, out of nowhere, he carried out the shocking act.

Despite being in his early 20s, police said he already had thinning hair.

He was wearing a black jacket with a black polo shirt underneath which had white detailing on the collar and a white logo.

Branch staff declined to speak about the incident in the aftermath,

If anybody does have any new leads, call police on 101.