TikTok is putting hundreds of jobs at risk in the UK, as it turns to artificial intelligence to assess problematic content.

The video-sharing app said a global restructuring is taking place that means it is "concentrating operations in fewer locations".

Layoffs are set to affect those working in its trust and safety departments, who focus on content moderation.

Unions have reacted angrily to the move - and claim "it will put TikTok's millions of British users at risk".

Figures from the tech giant, obtained by Sky News, suggest more than 85% of the videos removed for violating its community guidelines are now flagged by automated tools.

Meanwhile, it is claimed 99% of problematic content is proactively removed before being reported by users.

Executives also argue that AI systems can help reduce the amount of distressing content that moderation teams are exposed to - with the number of graphic videos viewed by staff falling 60% since this technology was implemented.

It comes weeks after the Online Safety Act came into force, which means social networks can face huge fines if they fail to stop the spread of harmful material.

The Communication Workers Union has claimed the redundancy announcement "looks likely to be a significant reduction of the platform's vital moderation teams".

In a statement, it warned: "Alongside concerns ranging from workplace stress to a lack of clarity over questions such as pay scales and office attendance policy, workers have also raised concerns over the quality of AI in content moderation, believing such 'alternatives' to human work to be too vulnerable and ineffective to maintain TikTok user safety."

John Chadfield, the union's national officer for tech, said many of its members believe the AI alternatives being used are "hastily developed and immature".

He also alleged that the layoffs come a week before staff were due to vote on union recognition.

"That TikTok management have announced these cuts just as the company's workers are about to vote on having their union recognised stinks of union-busting and putting corporate greed over the safety of workers and the public," he added.

Under the proposed plans, affected employees would see their roles reallocated elsewhere in Europe or handled by third-party providers, with a smaller number of trust and safety roles remaining on British soil.

The tech giant currently employs more than 2,500 people in the UK, and is due to open a new office in central London next year

A TikTok spokesperson said: "We are continuing a reorganisation that we started last year to strengthen our global operating model for Trust and Safety, which includes concentrating our operations in fewer locations globally to ensure that we maximize effectiveness and speed as we evolve this critical function for the company with the benefit of technological advancements."