Police have released new images of a man they want to speak to about a robbery in Lincoln last month.
It happened at the Mind charity shop on Lincoln High Street at about 14:30 on Sunday 26 January.
Three men entered the store and one man took a tablet from underneath the shop counter while the two others distracted the staff.
All three left the store and one was on a bike.
Later, a man on a bike was located nearby and challenged by a staff member from Mind who recovered the tablet.
The staff member was then assaulted and suffered injuries to his face and hands.
Anyone who recognises the man pictured is being asked to contact Lincolnshire Police.