Government officials said they have no evidence to support an earlier Iraqi claim that Islamic State forces were plotting to attack subway systems in the U.S.
Iraqi Prime Minister Haider al-Abadi said earlier Thursday that his country's intelligence operation has uncovered a plot for an imminent attack on subway systems in the United States and Paris.
The Iraqi prime minister said he was told of the plot by Baghdad and that it was the work of foreign fighters of the Islamic State group in Iraq. Asked if the attack was imminent, he said, "Yes."
Asked if the attacked had been thwarted, he said, "No." Al-Abadi said the United States had been alerted.
A senior U.S. government source told CNBC that the U.S. has no evidence to back up Abadi's claim of an Islamic State plot to attack the nation's subways.
Meanwhile, an NSC spokesperson said the U.S. "has not confirmed" Iraqi prime minister's warning that American and French ISIS fighters are planning a terror attack in the U.S. and Paris.
According to the Associated Press, Abadi made the remarks at a meeting with journalists on the sidelines of a gathering of world leaders at the United Nations General Assembly.
There is no evidence of any specific plot against the city's transportation, authorities at the FBI, New York City Police, Port Authority Police and Metropolitan Transportation Authority said.
Prior to the comments by the Iraqi official, U.S. law enforcement had not been told by any overseas partner of any new or specific threat regarding the subways, according to NBC News.
--AP contributed to this story.