They discovered five adult kangaroos and one joey dead.
A short time later, police were notified a further seven kangaroos and one joey had been found dead in the Maloney’s Beach area.
An injured joey was taken into the care of WIRES Wildlife Rescue.
“It is a tragic and senseless act that has left an indelible mark on our dedicated Mid South Coast branch volunteers who attended the scene, as well as the local residents,” the post said.
The joey had been “aptly nicknamed” Hope.
“We will continue to update you on Hope’s progress.”
After the alleged grisly discoveries, police launched an investigation and appealed for help from the public.
Last night officers arrested two 17-year-old boys at Bateman’s Bay Police Station.
They are due to appear at a children’s court on November 22.