West Yorkshire Police have circulated an appeal for witnesses after reports of anti-social behaviour in the Piece Hall last night.
A statement said: "Officers are aware of a video circulating on Social Media involving a group of youths causing anti-social behaviour in the Piece Hall on the 9th April between 445pm-6pm.
"Officers have spoken to the person who recorded the video and also a member of staff who was subject to threats. We are appealing for other witnesses who may be able to assist with the investigation to come forward.
"Please contact PC 1418 Andy Bingham quoting reference number 13180168572 if you are able to assist us with our enquiries. You can also send an email to email@example.com."