WICHITA, Kan. (AP) — Officials say vandals have spray-painted signs and wetlands boardwalks at a Wichita park, referencing “Pokemon Go” with some of their images.

The Wichita Eagle reports that the damage at Chisholm Creek Park was done Monday night.

Officials say the vandals also spray-painted names. Great Plains Nature Center director Jim Mason says those names have been reported to police.

Park staff had put out a sign welcoming “Pokemon Go” players and asking them to visit the center, located at the park, and sign up as volunteers.

The damage has disappointed park officials and some “Pokemon Go” players in Wichita who have played the game at the 282-acre park and volunteered to pick up trash while playing.