The Enforcement Directorate on Thursday conducted a survey at the Mumbai civic body's Central Purchase Department in connection with a probe into alleged irregularities in setting up of jumbo COVID treatment facilities in the metropolis, an official said.

The Brihanmumbai Municipal Corporation's CPD is situated in Byculla in south Mumbai and the ED team went through documents related to tenders and contracts awarded to a firm related to Sujit Patkar and three partners, the official informed.