A herd of brumbies has been wiped out in an on-foot shooting on open plains in Kosciuszko National Park.

11 horses, including a number of heavily-pregnant mares, have been found dead in the same area.

Brumby photographer Michelle Brown told Ray Hadley the scene would suggest high-powered rifles with silencers were used to kill the herd.

“It had to have been calculated, they had to have known where they were, there had to be multiple shooters, Ray, to bring down a mob of 11,” she said.

“I’m talking silencers and thermal imaging because it would’ve happened in the early hours of Sunday morning. It’s just horrific.”

Ms Brown said while she’s not pointing the finger at the NSW National Parks and Wildlife Service, the circumstances are “very suspicious”.

“They [wanted] to implement ground shooting at one stage, they [wanted] to implement shooting in the traps as a control measure.

“But ground shooting is something that’s not on the cards, so I don’t know, I would like National Parks to fully investigate this situation.”

Press PLAY below to hear Ms Brown’s reaction to the grim discovery in full 

Image: Snowy Brumby Photography Adventures with Michelle and Ian / Facebook