A thick layer of fog blanketed Delhi this morning causing disruption in the flight and train services in the national capital. The city also witnessed cold waves and temperature dip in the morning. Several flights are delayed at Indira Gandhi International Airport, Delhi, due to fog. Passengers have been requested to contact the airline concerned for updated flight information. Several trains are also running late at New Delhi railway station due to fog. According to the IMD, Delhi recorded 10 degrees Celsius temperature at 5.30 am today.