A horse believed to have been shot on James Island Thursday was not struck by a bullet, authorities said.

Charleston County Sheriff’s Capt. Mike Stanley said investigators have not determined what caused the injury to the horse at 990 Dills Bluff Road, but an exam revealed it was not a gunshot, as initially believed.

Investigators also have found nothing to link the injury to an incident on Wednesday in which a horse was reportedly shot in the head with what appeared to be a small-caliber firearm at 1360 Brownswood Road on Johns Island, Stanley said.