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In their statement, Kneecap also said: "They want you to believe words are more harmful than genocide."

Dirt collected by a resident at the site showed selenium, a trace element that can be harmful in heavy concentrations, according to the results, which were reviewed by The Times.

"Black women face a double patriarchy: Western expectations at work, traditional expectations at home. When these collide, harmful ideologies escalate," she told the BBC.

On Thursday, Tanzania's Agriculture Minister Hussein Bashe said trade restrictions from those two countries "directly affected" traders from his country and described the trade barrier as "unfair and harmful".

Many are "not fully aware of the harmful effects of the dust and debris", they added.