MESA, Ariz. - The Maricopa County Sheriff's Office is asking for help in identifying a suspect or suspects responsible for shooting three Salt River Horses.

According to MCSO, witnesses reported seeing someone shoot three Salt River horses on Oct. 21 at about 6 p.m. The suspect was seen shooting the horses at a location called "Pirates Island."

Investigators say witnesses saw a man with chasing the horses down and shooting at them multiple times with a shotgun. He was said to be with two other people at the time.

Three horses were hit -- two survived but are injured.

Volunteers say that Kai -- the 6-month-old horse that was killed -- was found to have four or five possible gunshot wounds and was mutilated. They say the suspect is believed to have removed the horse's genitals.

"They are like family to us, this is insane and all the words we have for this person are not good for TV," Simone Netherlands of the Salt River Wild Horse Management Group said. "This person needs to be brought to justice and we hope the public can help us up the reward to bring in tips that can lead to his arrest"

The suspect is a man described as wearing black shorts or underwear and a dark green shirt. No descriptions of the other two people were given.

Anyone with information is urged to contact MCSO.

PHOTOS: Suspect targeted this herd of Salt River wild horses