Delhi health minister Satyendar Jain flagged a huge oxygen shortage at another key hospital in the city this evening. Guru Teg Bahadur hospital -- run by the Delhi government -- has supplies for only four hours, the minister said. Pointing out that the hospital has more than 500 Covid patients on oxygen, he asked Union minister Piyush Goyal for help. The city, which is struggling to ensure medical treatment for critical patients, logged 28,395 fresh cases and 277 deaths over the last 24 hours.