Greater Manchester Fire and Rescue Service are using a tactic to let the fire burn out in a controlled way.
Andrew Heywood told ITV Granada Reports: "It's large quantities of flammable material, paper, plastic that's been shredded and compacted...So there is a massive fireload in that building and it will continue to burn for days".
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Commuters are facing major disruption after last night’s city centre fire caused part of the Metrolink to shut down.
The mum shot in the legs by a gunman who also shot her seven-year-old son has been named locally as Jayne Hickey.