Homeland Security Secretary Janet Napolitano said Sunday morning that the administration is "certainly considering" that the car bomb found in New York's Times Square could be an act of terror.

"Luckily, no one is hurt, and now the full attention of city, state and federal law enforcement will be turned to bringing the guilty party to justice in this act of terrorism," New York Gov. David Paterson said in a statement.

When asked about Paterson's characterization of the incident, in which a T-shirt vendor noticed smoke coming from the back of an SUV and notified police, Napolitano said forensic evidence plus video footage from the area was being analyzed.

"We're certainly considering it now that it could be an act of terrorism or was intended to be an act of terrorism," Napolitano said on "Fox News Sunday."

Napolitano said they were "not ruling anything out."

On ABC's "This Week," Napolitano indicated that officials see it as an isolated incident.

"Right now, we have no evidence that it is anything other than a one-off, but we are alerting state, local officials around the country, letting them know what is going on," she said.

Napolitano said there wasn't an indication that New Yorkers should be too alarmed.

"Times Square I think is now safe, and I believe that right now, we have no information other than it is a one-off," she said. "But nonetheless, we are alerting state and local law enforcement, everybody to be on their toes."

This post was updated at 10:30 a.m.