The IOPC said the man’s family had been contacted to “express our condolences and explain our involvement”.
“Our role is to independently investigate all circumstances surrounding this incident, including the actions and decisions taken by officers,” said operations director Steve Noonan.
“While police shootings are thankfully rare, it is understandable that people are concerned when they do happen, and it is important that we conduct a detailed and robust investigation into what took place.”
West Mercia Police said the IOPC would now lead the investigation and could not comment further.
The watchdog is said to be at a “very early stage” of its investigation and is unlikely to comment further before the full investigation has taken place.
No one else was at the address during the incident and the coroner has been informed that a post-mortem examination would take place.