"There is no credible evidence so far that this attack was more than at least one person, the driver," said Mayor Mike Bloomberg. "After that there is no evidence that anyone else was involved. It may be, but we can't say that it is."
"There is some speculation that the materials in the Nissan Pathfinder were similar to ones that were found to some failed attacks in the U.K.," Couric asked.
"There's a limited number of things you would need," Bloomberg said. "You'd need a timer, you'd need a battery as an energy source you'd need some explosive and you'd need something to enhance it. That's going to be true no matter where or when the...another attack took place. So, anything would have enough commonalities for the conspiracy theorists to blow it up if you don't mind the pun and make something out of it."
"Are you concerned about the impact this might have on tourism?" Couric asked.
"I think people today understand we live in a dangerous world," Bloomberg said. "And you can't let the terrorists win by locking yourself in a room. What I can guarantee you is we're doing everything that we can. Whether or not we will have somebody in exactly the right place at exactly the right time to prevent something down the future nobody can do that - nobody can guarantee you."
"But there is no evidence here of a conspiracy. There is no evidence that it's tied in to anything else. It looks like an amatuerish job, done by at least one person," Bloomberg added.
But if another attack were to occur, Mayor Bloomberg and the heads of all emergency response agencies would be in the city's situation room. It's powered by its own generator and allows the team to monitor video feeds, television coverage - even the corner of 45th and Seventh Avenue, where a crisis was averted.
Law enforcement officials don't know who left the Nissan Pathfinder behind, but at this point the Mayor believes the suspect acted alone.
"If I had to guess, twenty five cents, this would be exactly that," Bloomberg said. "Homegrown maybe a mentally deranged person or someone with a political agenda that doesn't like the health care bill or something. It could be anything."
In the immediate area, there are some 82 police surveillance cameras and many more owned by the private sector.
Police commissioner Ray Kelly says the investigation is time-consuming and so far, he has ruled nothing out.
"I think it's dangerous to characterize it as amatuerish. We don't know the motivation behind it. We know somebody had the motivation to kill people, or seriously injur people. This investigation has a long way to go," Kelly said.
More on the Attempted Times Square Bombing
Possible Bomb Suspect Caught on Tape
Bloomberg on NYC Bomb Scare
Task Force Seeks Car Bomber
After NYC Scare, Pakistan Taliban Vows Attacks
Mayor: Times Square Bomb Not Linked to Al Qaeda
Napolitano: Not All Bomb Attempts May Fail
Times Square Bomb Threat: Ordinary yet Deadly