Firefighters were called to an incident in Chesterfield town centre this morning.
Staff at the amusement arcade in Burlington Street left the premises at around 9am after reporting smoke.
The fire service arrived shortly afterwards and cordoned off the area to conduct investigations.
The staff, who were huddling in the doorway of Topshop next door, said they had not been told what had happened or when they will be allowed back inside.
There are no reports of any injuries.