The increased presence and visibility

At the Capitol Complex, there is currently no known threat, Captain Kim Schneider of the U.S. Capitol Police said in a statement, but said "enhanced patrols throughout the Capitol Campus may be observed, conducted out of an abundance of caution."

A “Security Awareness Reminder” sent from the U.S. Capitol Police Board to congressional offices today said, despite the lack specific threat to the Capitol Complex, "it will always be an appealing target," and the Capitol Police have increased visibility in a number of areas.

"The increased presence and visibility is a proactive enhancement of our already heightened security posture," the U.S. Capitol Police Board statement said.

"If something looks amiss, please do not hesitate to bring it to someone’s attention," the statement said. "Also, out of an abundance of caution, take simple precautions, such as using the tunnels when coming to the Capitol or informing your office of your whereabouts."

D.C.'s Metro Transit Police Department has also increased patrols system-wide "for an unspecified period of time" and will also conduct more random explosives screenings, the department said.

Diego Rodriguez, the Assistant Director in Charge of FBI's New York office, said today that, at this time, there is no connection between the Paris attacks and New York City, and an official with the NYPD counter-terror bureau told ABC News today that no changes in public events are expected for the Thanksgiving parade or the holiday shopping season.

This afternoon, New York City Mayor Bill de Blasio and NYPD Commissioner Bill Bratton announced the first deployment of NYPD's new Critical Response Command of the Counter-Terrorism Bureau. The officers will conduct daily deployments at critical infrastructure and sensitive locations in the city.