The Income Tax Department on Tuesday conducted a survey operation at the BBC's offices in Delhi and Mumbai as part of a tax evasion investigation, officials said.

The surprise action comes weeks after the broadcaster aired a two-part documentary on the 2002 Gujarat riots and India.

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The department is looking at documents related to the business operations of the company and those related to its Indian arm, they said.

As part of a survey, the Income Tax Department only covers the business premises of a company and does not raid residences and other locations of its promoters or directors.