There was an alarm and an accompanying announcement at 1.45pm on Monday.
The shopping centre was evacuated and there were shoppers out on Corporation Street and some of the surrounding streets.
The accompanying announcement said it was due to “an emergency” but a spokesperson said there were “no issues to report”.
Market Place was back open as of 2.05pm on Monday.
This article was written by Jack Tooth. To contact him, email jack.tooth@newsquest.co.uk or follow @JTRTooth on Twitter.