Police in southern Greece say 26 wild horses have been shot and killed on a remote mountainside, but the motive for the attack remains unclear.

The dead horses were first discovered Thursday on rugged slopes of the 2,376-meter (7,795-foot) Mount Cyllene, 140 kilometers (85 miles) southwest of Athens.

Police major Constantine Vragalis of the southern Peloponnese Police directorate told the Associated Press on Monday that 23 horses were found dead and three other horses that were injured also later died. Police said the horses were privately owned but were allowed to roam wild in the region.