Five persons were killed in four different accidents in Dankaur and Jewar areas due to dense fog on Monday. A 25-year old youth was killed when a pick-up truck hit his motorbike in Kanarsi village. In the second incident, two youths were killed on the Jewar-Jhajjar Road when their motorcycle crashed into a tractor. In the other two accidents, a 35-year-old biker was killed near the Jewar interchange while a truck driver died after his loaded truck fell off the Yamuna Expressway.