Another parking meter was damaged by a firework in Lewes this week, taking the total of vandalised parking meters in recent weeks to three.
Sussex Police is appealing for witnesses after the meter was vandalised between 6pm on November 1 and 7.30am on November 2.
Around £200 worth of damage has been caused to the front of the meter and the coin slot, which is in the car park behind Lewes Castle car park.
Police warned those responsible for damaging parking meters in Lewes that they were putting people’s lives at risk - after two were blown up in the town overnight in October.
A pay and display machine in Phoenix Place and another in Friars Walk, Lewes, both had fireworks set off in the coin slots.
The first one suffered £1,000 worth of damage and the second one has about £1,900 worth of damage.
Vandals carried out 15 attacks on 14 parking meters in the town last year between September and November by placing explosives inside them and blowing them up.
Similar incidents have been reported each year since 2004.
Chief Inspector Jason Tingley, Lewes district commander, said: “I find it difficult to understand why anyone would be so reckless as to carry out such potentially dangerous acts. I’m amazed that someone hasn’t been injured.
“This amounts to a serious spree of costly vandalism.
“We are warning the culprits that we are still determined to find out who is responsible.
“Someone knows who is doing this and it is important that they help us put a stop to it now before someone gets seriously injured.
“We will be stepping up patrols and I would ask the community to be vigilant and report any suspicious behaviour.
“If you have any information, please contact Sussex Police on 101 quoting Operation Cohesion or the independent charity Crimestoppers anonymously on 0800 555 111.”
There is a £1,250 reward for information leading to an arrest and conviction of those responsible for the attacks.
This is being offered jointly by East Sussex County Council, Sussex Police and Lewes District Council.