The number of unemployed people in the North West now stands at 325,000, the largest figure outside London.
This represents 9.6% of the working population, meaning the region is behind only London and the North East in terms of percentage of people unemployed.
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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".
He served in Margaret Thatcher's Cabinet as Home Secretary in 1989 and was also a former Governor of Bermuda.