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New Delhi, Dec 09 (ANI): Delhiites woke up to a chilly morning as a dense layer of fog enveloped most parts of northern India on Friday. Several railway passengers too had a tough time with at least 67 trains delayed, 30 rescheduled and 2 cancelled due to fog. The fog conditions accompanied by low visibility also affected the traffic movement. As predicted by the Met department, the city may also witness couple more mornings of dense fog in the coming days.