Jasenovac concentration camp
Every night for about 20 days, Ustaše officers brought in lists of prisoners who they planned to execute.  They stripped, chained, and beat these prisoners.  Then they took them to the Granik.  There, weights were tied to them; their intestines and necks were cut; they were hit in the head; and then they were thrown into the river.  Over time, the Ustaše changed this method, so that inmates were tied in pairs, back to back, and their bellies were cut open before they were tossed into the river alive.