Three members of the Tablighi Jamaat tested positive for coronavirus in Uttar Pradesh's Muzaffarnagar on Wednesday, an official said.
According to Chief Medical Officer Praveen Chopra, they had taken samples of 27 members of the Jamaat, three of which were found infected with the infection.
He said the Jamaat members had already been quarantined.
He said, meanwhile, a woman from the district tested positive for the virus in Noida.
Precautionary measures have been taken after receiving reports of the four cases, he said.