The number of jobs at risk from the collapse of British Steel is over 32,000, much higher than previously feared, a new study suggests.
The GMB union said that as well as the thousands directly employed, another 28,395 work in the supply chain.
Previous estimates had put the number of jobs at risk at 25,000 but the new analysis reveals thousands more are in the balance, said the union.
Delegates at the GMB's annual conference in Brighton urged the Government to do more to save the jobs.
British Steel went into compulsory liquidation in May, putting thousands of jobs at risk, mainly at its site in Scunthorpe.