Labourers work at a construction site amid heavy fog near the airport in New Delhi Dec 27, 2010. At least 6 people died over the weekend due to the cold weather in the north of the country, according to local media reports. A thick layer of dense fog blanketed the Indian capital for the second day in a row on Monday, severely disrupting air and rail services to and from the city, transport officials said. [China Daily/Agencies]