National Police Air Service Barton have released new footage of the fire in Salford taken from their helicopter.
Forty fire fighters were needed to bring it under control.
A nearby rail line was suspended for a time this morning over fears the building could collapse.
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Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."
Business Secretary Greg Clark said talks with Peugeot's boss over a potential Vauxhall takeover were both "constructive and reassuring".