Boxes full of vital respirator masks were stolen last week.
Essex Police is appealing for information after the boxes of respirators were taken from outside a property in Hollyfield, Harlow.
Respirators are in high demand at hospitals fighting to halt the spread of coronavirus.
An Essex Police spokesperson said: "We are appealing for information following a theft on Friday, March 27 at around 2.50pm.
"Boxes containing respirators were taken from outside a property in Hollyfield in Harlow where they were waiting to be collected by a courier.
"Two men in a black car were seen driving away."
Anyone with information or CCTV in the area a vehicle of this description in the area is asked to call Harlow Local Policing team on 101 quoting crime reference 42/46908/20.
Information can also be given completely anonymously to independent charity Crimestoppers by calling 0800 555 111 or visiting crimestoppers-uk.org
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