"Just a little over a mile away from the placement of the first device, a group of terrorists boarded airplanes and launched an attack on New York City," police Commissioner Edward Davis said in an interview with The Associated Press.
"The city clearly did not overreact. Had we taken any other steps, we would have been endangering the public," he said.
The publicity campaign was conceived by the Adult Swim marketing department and approved by the head of the Cartoon network, Powell said Thursday.
"This was never intended to be a marketing campaign designed to create fear or public safety concerns," she said. "We were simply promoting a TV show. If we had ever perceived this to be something threatening safety, we would never have proceeded with it."
The network told the marketing company to decide where the devices should be placed, with the mandate they should be in places likely to be seen by young men. Adult Swim's target audience is men aged 18-to-24.