Reserve Bank of India Gover**r Raghuram Rajan said on Saturday that action should be taken against wilful defaulters, but there shouldn't be a "broad fishing expedition" that scares away banks and restricts lending, especially to the critical infrastructure sector. "We have to be careful as we go forward that criminal actions are penalized," Rajan told the media after the central bank's board meeting.Finance Minister Arun Jaitley, who attended the meeting, also cautioned against overstating the bad loans crisis.