At least 21 trains were running late and seven cancelled due to dense fog in parts of north India on Tuesday morning, a railway official said.

The status of the delayed and cancelled trains was last updated till morning 5 a.m.

According to the Northern Railway official, nine trains were rescheduled.

The cancelled trains included New Delhi-Hyderabad Telangana Express, Jammu Tawi- Bhagalpur Amarnath Express, Jaynagar-Amritsar Saryuyamuna Express, New Delhi-Rajgir Shramjivi Express, Kota-Patna Express, New Delhi-Bhubhneswar Rajdhani Express and Amritsar-Kanpur Central Express.