The NYPD has extra manpower in position, and there are extra bag screenings at various train stations. New Yorkers are being reminded, as always, if you see something, say something.
"The person sitting next to you may be an undercover cop," Mayor Michael Bloomberg said. "You never know. You never know. And that's the thing. You're not going to see most of the steps we take to keep this city safe."
While police say there are no specific threats against New York, there are growing fears of retaliation for the killing of Osama bin Laden.
"In the short term, I think we have to worry about lots of repercussions from this," former Mayor Rudy Giuliani said.
Giuliani, who received an invitation to join the president, expressed his concerns to ABC's Diane Sawyer. They are concerns that plenty of New Yorkers share.
Reports of suspicious packages have spiked in recent days, and there were more than 60 across the city on Monday alone. All of them were false alarms.
"I don't think people need to be unnecessarily or unduly worried," said Janice Fedarcy, assistant director of the New York FBI. "I think really it's a matter of just maintaining vigilance of not becoming complacent."
Security will continue to tighten as the city prepares for the president. Obama is expected to visit firefighters at a firehouse in Midtown before heading to ground zero to meet with a small group of September 11th families.