In the first week of March, the Tablighi Jamaat held a religious congregation at the New Delhi headquarters. More than 1,000 people participated. Some of the participants, including senior preachers, had come from countries like Saudi Arabia, Malaysia and Indonesia where Covid-19 had already spread.

from Times of India https://timesofindia.indiatimes.com/city/delhi/disaster-at-delhis-nizamuddin-how-covid-19-spread-from-here/articleshow/74904574.cms