Two security officers were robbed and injured whilst delivering cash at an industrial estate in Southall , police said.
A call was made to police at 5.30am to Bulls Bridge Industrial Estate, in Hayes Road, on Thursday (November 9).
Police confirmed that "property" was stolen during the "cash in transit" incident, but no arrests have been made.
An area near the Tesco Extra was taped off whilst officers attended the scene.
A Metropolitan Police spokesperson said: "Two security officers delivering cash were robbed by two men.
"One security officer was struck with an object and the other was punched.
"Neither officer suffered life changing or threatening injuries.
Detectives from the Met's Flying Squad are investigating and ask that any witnesses or anyone with any information call them on 101 or contact via Twitter @MetCC.
To give information anonymously contact Crimestoppers on 0800 555 111 or online at crimestoppers-uk.org.
Keep up to date with the latest news in west London via the free getwestlondon app.
You can set up your app to see all the latest news and events from your area, plus receive push notifications for breaking news.