A man delivering a parcel was knocked to the ground by three men who stole his keys and drove off in his van.
Police were called to a robbery in South Close, Morden, at lunch time on Friday.
The 39 year-old male victim returned to his van after delivering a parcel when he was approached by three men at about 1.20pm.
A police spokeswoman said he was pushed and fell to the ground and his keys were pulled from his belt.
The three men then got into the van and drove off.
A friend of the victim said the van was a white Mercedes sprinter with the registration number ZB57 XDT.
Police are investigating and no arrests have been made.
Anyone with information is asked to call police on 101.
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