North Korea is sending 'filth' to South Korea by balloon

Officials in South Korea say that more 250 balloons were sent across the militarized border from North Korea in the last day or so. The balloons dropped plastic bags full waste paper, garbage and perhaps even manure. The government in North Korea had warned that it would respond to activists in South Korea who sent antigovernment leaflets by balloon into North Korea. The World's Matthew Bell reports.