A brick has been thrown through the window of a Royal Mail van.
The incident took place on Watling Street, Radlett, between 6.30am and 7am on Friday, December 30.
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At that time, the van had been left parked outside the Royal Mail's sorting office.
Hertfordshire police have now appealed for witnesses to come forward.
PC Mike Morris said: "I’m appealing for anyone who was in the area at the time and saw what happened to get in touch with me by emailing michael.morris@herts.police.uk, quoting crime reference 41/105169/22."
Information can also be reported online at herts.police.uk/report or by calling non-emergency number 101.
Anonymous information can be given to the independent charity Crimestoppers on 0800 555 111 or via crimestoppers-uk.org.
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