South Korea’s military on Wednesday accused North Korea of floating balloons loaded with trash and manure across the border and immediately demanded that Pyongyang halt its “inhumane and vulgar” operation. More than 260 balloons have already been detected in South Korea since the operation began on Tuesday night, South Korea’s Joint Chiefs of Staff said. Images released by the military appear to show the balloons carrying plastic bags—one of which had the word “excrement” written on the side...