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In the clip, Gwilym Owen, 27, can be seen tearing into the plastic covering the items at a Tesco store in Bangor, where staff had wrapped up products not deemed essential by the government as part of Wales' firebreak lockdown.
Owen, who was not wearing a face mask during the incident, says in the video: "Since when have clothes been exempt? Since when have clothes been non-essential?"
He adds: "Kids' f***ing clothes, it's a disgrace. We're coming into winter now."
As he pushes barriers over and rips the coverings from the items, many fall onto the floor as staff begin to rush over to Gwilym and the person filming him.
"All you need to do is not comply," Owen says.
As the store's security staff approach Owen, the footage cuts off.
Owen later addressed the incident in a post on Facebook, where he said he was 'not ashamed' of what he did.
He wrote: "I had enough last night. I don't care about the backlash that I may get from this.
"I heard supermarkets have put covers over 'non essential' things such as clothes. We're heading into winter now and who would have thought clothes for children weren't essential?
"I'm sure there are people out there who can barely afford heating in their houses and now they want to stop people buying clothes in supermarkets.
"I don't expect everyone to do what I've done here, but I do expect everyone to know that denying the public clothing is nothing but immoral and inhuman.
"So no I'm not ashamed of what I've done.
"I'm not prepared to live in a society where they can take basic human needs away like being able to buy new clothes, especially for children. So I'll do what I can to stop it.
"I've had it up to my tether with what's going on and we need more people to take a stand for what is right! This was my stand."
A spokesperson for Tesco said: "Under new restrictions set out by the Welsh Government, we are currently unable to sell 'non-essential' items in our stores.
"Our colleagues have worked hard to put these measures in place and we ask that customers please respect these restrictions."
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