Police are investigating the burglary of a post office in which explosives were used to burst open the back of an ATM machine.

The robbery took place at 5am on Saturday morning at a post office in Greenford Road, Harrow.

A police spokeswoman said: "On arrival officers found that the shutters had been forced open, the windows smashed and there was damage to the front and the back of the ATM.

"A quantity of cash was missing from the ATM.

"Four men wearing balaclava's were seen to break into the post office, then drive off in a silver coloured car in the direction of Whitton Avenue."

Enquiries are ongoing and no arrests have yet been made.           

Similar methods have been used in unrelated burglaries in both Hillingdon and Kew this year.