Image: Twitter / @braddybb
UPDATE: It is believed that the incident was due to a workplace accident. Minutes after the police entered the building with a dog, the store was re-opened to the public.
A police operation is currently underway at the Apple Store on George Street, Sydney.
Customers at the store tweeted that there was an evacuation and six police cars turned up to the scene.
"We were just rushed out of the store, loads of police going in," one customer tweeted.