Production will stop at Vauxhall's Ellesmere Port site this week because of falling sales.
The company say the decision is normal working practice as they react to a decline in demand.
They say all staff will still be paid.
The move is in stark contrast to neighbours Jaguar Landrover who have recently stepped up to 24-hour production.
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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.