The centre today appealed to the frontline workers to get vaccinated before the deadline; coronavirus is unlikely to have come from a lab in China, the World Health Organisation said; Uttarakhand disaster: Rescue operations are on but time is running out; Prime Minister Narendra Modi gives a tearful farewell to Ghulam Nabi Azad in Rajya Sabha; Petrol and diesel prices are at a record high; and other top news of the day.