Sources in the central agency said Mukherjee's response to the posers were "straightforward".
The Narada tapes showed Mukherjee purportedly accepting money from a businessman.
Posing as a businessman, Narada News CEO Matthew Samuels had conducted sting operations on several Trinamool Congress MPs, MLAs and ministers in 2011.
Mukherjee left the ED office after questioning.
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