NEW YORK (AP) — Some of New York's top government officials took to the nation's largest subway system Thursday, urging calm just hours after Iraq's prime minister told reporters that captive Islamic State militants told intelligence agents of a plot to attack subways in the United States and Paris.

Gov. Andrew Cuomo, standing with Metropolitan Transportation Authority Chairman Tom Prendergast at Manhattan's Penn Station following a trip on the E train, said "there is no specific, credible threat to the New York City subway system."

"Fundamentally, what the terrorists are trying to do is disrupt our lifestyle and disrupt our democracy, and we shouldn't let them do that in any manner, shape or form," he said.

After taking an uptown 5 train together, Mayor Bill de Blasio and police Commissioner William Bratton said at a press conference security throughout the city and its transit system was already heightened for the United Nations General Assembly but more officers had been deployed while law enforcement assessed the prime minister's remarks.

"We have received information that in the eyes of the U.S. government and the NYPD is not verified," de Blasio said.

Bratton said more bomb-sniffing dogs and security teams had been deployed around the city. He said officers were increasing bag checks at subway stations.

"We always in New York, because of the target that we will remain, we will remain at a heightened level of awareness," he said.

About 5.5 million daily passengers take city subways, and New Yorkers have experienced many warnings of potential terror plots since the Sept. 11, 2001, attacks.

On Thursday, commuters took the news in stride.

"What are you going to do?" asked John Edwards as he waited for a subway train.

If residents of the nation's biggest city shied from going about their daily lives every time there was a terror concern, "you'd never be able to move forward," he said.

Commuter Ed Bullen, at Grand Central Terminal, said he's undeterred by the reported threat.

"Carry on as usual," he said.

Cuomo and New Jersey Gov. Chris Christie this week announced increased security across their states after increased activity by terrorist groups overseas. The security includes more uniformed officers at transit hubs and on trains. Security also will be increased at the area's bridges, tunnels and ports, the governors said.

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Michael R. Sisak contributed to this report.