Life-saving equipment worth tens of thousands of pounds has been stolen from East Grinstead Ambulance Station.
It happened between 4pm on 30th June and 7.45am on the 3rd of July.
A locked store room and two ambulance vehicles were broken into, and at least six defibrillators valued at a total of around £34,000 were stolen.
A further break-in occurred at the station overnight on Sunday and on this occasion a set of keys to an ambulance were stolen.
The ambulance itself was not damaged or stolen.
The incidents are being linked to a similar theft of medical equipment from Hastings Ambulance Station on 25th June.