The incident in the city of Nashik, one of India's worst-hit areas, happened after the tank of oxygen leaked, said Rajesh Tope, the health minister of Maharashtra, the richest state, where the city is located.
"Patients who were on ventilators at the hospital in Nashik have died," Tope said in televised remarks.
"The leakage was spotted at the tank supplying oxygen to these patients. The interrupted supply could be linked to the deaths of the patients in the hospital."