FBI agents and police say those raids in New York were carried out with a sense of urgency, and details are just starting to come out. But there is word of a possible link to al-Qaeda.
This raid comes just a few days after the anniversary of Sept. 11.
It happened early Monday morning in the borough of Queens.
According to sources, the target of today's raid was a young man who had just arrived in New York over the weekend.
New York City Police and the FBI were on the anti-terror task force that carried out the raid Monday morning.
According to ABC sources, agents had been tracking a man with alleged ties to al-Qaeda.
That unnamed man had just returned to the U.S. from visits to Pakistan and Afghanistan.
Investigators have not disclosed if there is some kind of connection between the raid and the latest Osama Bin Laden audio tape, which was released over the weekend.
While authorities in New York have foiled previous plots against the subway system or airports, the intended target of this latest alleged plot has not been publically disclosed.
A neighbor at the apartment building in the predominantly Asian neighborhood in Queens says he saw police arrest as many as 10 people. However, footage from local news crews showed only one man being led away by FBI agents.
New York Senator Charles Schumer was briefed on today's raid. He says an attack was not immanent, but he says the threat was very real.
"The FBI is quite good now at tracking would-be potential people who might create problems down the road, and I would characterize these raids as preventative," says Schumer.
Authorities are not disclosing much more about this Monday's raids, except only to say that no weapons or bombs were found at the apartment in Queens.