Police Commissioner Ray Kelly says there have been no specific threats, but he points to last May's plot to detonate car bombs outside the Riverdale Temple and a nearby Jewish center.
The four men charged in that case are still awaiting trial.
Meanwhile, the latest plot to bomb the city is adding urgency to a renewed plea to restore federal funding to protect New York against terrorism.
The Obama administration recently cut all funding for the "securing the cities" program.
It was supposed to position radiation sensors at major crossings into the city to help prevent a nuclear attack or dirty bomb. Local leaders say New York remains the number one target in the world, so it needs additional resources.
"Following 9/11, the federal government correctly put resources into this program," New York Sen. Charles Schumer. "NYPD is leading the way in implementing this high-tech system, but we need federal funding to provide sufficient resources to finish the job."
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