India’s devastating coronavirus crisis deepened on Thursday, as the country reported 412,000 infections and nearly 4,000 deaths in the previous 24 hours.

Epidemiologists believe that India’s surge could hit 500,000 cases a day in the coming weeks before retreating. That would represent a ruinous burden for a health-care system reeling from too many patients and a shortage of crucial supplies like oxygen. Last month, the United States advised its citizens to leave India and on Thursday, the State Department authorized the voluntary departure of non-emergency personnel.