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At around 7.55pm on Friday 7 January 2020, officers were called to Pizza Hut on Fountain Street near Piccadilly Gardens.
Emergency services attended and enquiries have established that a man entered a short time before dispersing the spray.
20 customers and staff were assessed by paramedics at the scene. None required hospital treatment but some were distressed.
The offender is described as being black, between the ages of 25 and 35, 6ft tall and of an athletic build. At the time of the incident, he was wearing a light coloured hoodie with a zip, grey trousers and white trainers. He was also carrying a dark-coloured shoulder bag.
An investigation is underway.