But extra officers with helmets and bulletproof vests are at spots like Grand Central Terminal in midtown Manhattan.
Police Commissioner Raymond Kelly would not comment on the probe that led to a nationwide terrorism warning Tuesday for entertainment complexes, sports stadiums and hotels.
Three people, including a Queens imam, are charged with lying to officials investigating the alleged plot.
Kelly says the city is "obligated" to put itself on heightened alert whenever possible plots surface because of previous attacks in the city.
The Long Island Rail Road issued the following statement to its riders:
"In light of recent arrests, the LIRR would like to remind customers and employees to be vigilant and report suspicious activity, persons and/or packages to authorities. The MTA Police Department is a member of the Joint Terrorism Task Force and is in constant contact with federal, state and local law enforcement. While there is no credible threat on our system, we have increased police presence at key locations in light of the ongoing investigation."
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