A First Information Report was filed by city police on Friday against four persons for holding a bogus Covid-19 vaccination camp for more than 600 workers of a diamond firm, an official said.

This is the ninth FIR in connection with the racket which came to light earlier this month. Six persons have been arrested so far, including Dr Manish Tripathi, the prime accused. Claiming to represent reputed private hospitals, the gang allegedly organized unauthorized and bogus vaccination camps for large housing societies and private firms.