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In Unfinished Tales, The hunt for the ring, it is stated that Sauron was in great haste and fear when he heard that his enemies have captured Gollum. Apparently, he fears for anyone who has access to those with relevant information about the ring. Sure, he wants information for himself, but he also wants to hold off others from obtaining that information. I think that in this "others" we can safely include Saruman, of whom Sauron became aware that his servants waylaid or misled his own agents.
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