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But Mr. Kaniewski questioned whether the new system would make that big a difference to the underlying problem, which was “how much information to share” with the public.

“The more detailed the information you provide [about a plot or other threat], the more likely it is you might interfere with the investigation — and the efforts to interdict the attack,” he said.

Nonetheless, he applauded the change, calling it “a step in the right direction.”