Thieves stole the two letter ps from new signs outside Pontefract Park – just weeks after campaigners completed refurbishment work at the site.
Pontefract Park Steering Group set up CCTV at the site, created more parking spaces and reopened vandal-hit public toilets last month.
Just hours after proud members of the group met to celebrate their success, thieves stole two slides – worth £4,000 – from the park playground and now parts of the entrance sign have been swiped.
Pontefract North Coun Clive Tennant, who is a member of the group, said: “What’s happened is sickening after all the hard work that’s gone on.
“But the thieves will not prevail, we have been getting a lot of praise in the community so we will continue with our work.”
The steering group formed a year ago after residents called for improvements at the site.
The group includes representatives from Pontefract Racecourse, Friends of Pontefract Park, ward representatives and council officers.
Jack Kershaw, chairman of Friends of Pontefract Park, said: “The recent thefts at the park are absolutely disgraceful.
“But nothing will stop us from cracking on and enhancing the park.
“If people are only coming to the park to thieve then they are not welcome.”
Wakefield Council this week replace the letters on the sign and hopes to fund replacements for the slides.