All six patients have been kept in isolation, the health ministry said in a statement on Tuesday, adding that their fellow travellers were being tracked down.
The capital recorded 944 new coronavirus cases on Wednesday, just under the record 949 recorded on Saturday, and medical experts warned that unless the outbreak is checked the city could soon see over 1,000 new patients a day.
German Chancellor Angela Merkel on Thursday pushed for a “significant” tightening of curbs to slow the infection rate as the European Union’s most populous country added more than 22,000 new cases.
The epidemic has infected nearly 1% of India’s more than 1.3 billion people, second to the worst-hit United States. After hitting a peak in September, daily cases are now down to an average of 27,000.
Daily cases have been falling steadily in India since a peak in September, in spite of a busy festival season last month. India has recorded the world’s second-highest number of infections, after the United States.
India’s coronavirus caseload stood at 8.1 million on Saturday, with 48,268 new cases being recorded in the last 24 hours, data from the health ministry showed.
The total number of coronavirus cases in the country mounted to 8.79 million cases, while the deaths rose to 129,635 , health ministry data showed on Sunday.
India is only the second country to cross 9 million coronavirus infections, after the United States, but cases have slowed down in the country after hitting a peak in September.
According to the Union Health Ministry's data updated on Monday the recoveries surged to 88,47,600. The death toll climbed to 1,37,139 after 443 more fatalities were reported.