Four men were arrested after a vandalism spree at a Royal Mail sorting office on Thursday morning (May 16).
Two vehicles were considerably damaged and the windows of the office in Sarum Road smashed at about 12.15am.
The men were arrested shortly afterwards at a nearby fast food restaurant, on suspicion of causing criminal damage.
Detectives are keen to hear from anyone who was in Sarum Road at the time of the incident and may have seen anything suspicious.
If you have information relating to this incident, contact Bedfordshire Police, in confidence, on 01582 394319, the non-emergency number 101, or text information to 07786 200011.
Alternatively contact independent charity Crimestoppers, anonymously, on 0800 555 111, or online at crimestoppers-uk.org.