Notices were served to Faruqui and others by the police and they were allowed to go.
The police said that the threat email was sent from the accused, Mohammed Arshil's ID.
The Colaba Police have registered an offence against more than 350 persons for the 34-hour-long protest at the Gateway of India.
The ED has summoned Raj in a case pertaining to alleged irregularities related to Infrastructure Leasing and Financial Services loan to Kohinoor CTNL.