Tata Steel is due to announce that it plans to sell its entire UK steel operation, according to media reports.

The news casts doubt over the future of thousands of steelworkers' jobs across the UK.

Union leaders have been in Mumbai, India, where the Tata board has met to discuss the company's loss-making UK business.

They had been hoping Tata would agree a plan to keep steelmaking in Port Talbot and other UK plants.

Other plants that will be affected include Rotherham, Corby and Shotton.

Tata announced more than 1,000 job cuts in January, including 750 at Port Talbot in south Wales.

Thousands of steel jobs have been lost in the last year, with companies blaming cheap Chinese imports and high energy costs.