New Delhi: A thick blanket of fog covered the National Capital Territory this morning. All departures from Delhi Airport were on hold from 5:30 am to 7 am today and most of the arrivals were also hit due to poor visibility and bad weather. Train services have also been affected with 10 trains to Delhi running late due to fog as of now.The Delhi Traffic Police alerted commuters of poor visibility. Tweeting a list of 'Dos and Don'ts', the police said, "Visibility low due to intense fog in the border areas and area around India Gate in Delhi. Drive with caution. Maintain moderate speed. Drive with headlamps switched on."