If you are the first person to arrive at your business premises and there are signs of an apparent break-in, consider your personal safety first. Rather than rushing in, call the police and ask them to check it out as the intruder may still be inside. If you’re not the business owner, call whoever is in charge and inform them.
If you are already inside the building when you realise there has been a break-in, leave immediately without touching anything. Your work environment is now a crime scene, so try not to disturb it. Take a note of anything you have touched.
Once the police have gathered evidence you may be able to reopen your business premises, but make sure support is on hand for anyone who has been affected by the crime and that any unauthorised paths of entry and exit, for example broken windows, are dealt with swiftly.