Department of Homeland Security Secretary Janet Napolitano told ABC's Jake Tapper that authorities had not found any evidence that the bomb scare in New York City was part of a larger plot.
"We have no evidence right now that this is anything other than a one off," said Napolitano.
The federal government is treating the incident as a potential terrorist attack.
UPDATE (Nicole): Pakistani Taliban claim responsibility for NYC bomb scare
UPDATE 2 (Nicole): The NYPD is discounting any foreign presence in the failed car bombing. Per HuffPo:
New York Police Commissioner Ray Kelly announced at a press conference this afternoon that the NYPD is working on several leads related to Saturday night's failed car bomb attack in Times Square.
Kelly said the police identified the owner of the Nissan Pathfinder used in the plot. Investigators are also analyzing a video of a white male, in his 40s who was seen acting suspiciously around the car.