ISIS threat: NYPD on high alert after new video urges attacks on Western nations

New York City's police department has been alerted to a new threat by the Islamic State of Iraq and Syria (ISIS). In the video, ISIS spokesman Abu Mohammed al Adnani specifically mentioned the U.S., France, Australia and Canada as targets. The message is consistent with a previous one from al Adnani, calling for attacks on police officers, soldiers, intelligence officers and government employees.

"As you may recall, there was a similar threat, a Twitter threat, back in September, and shortly thereafter there were a number of attacks in Canada, Australia, also an attack here -- an ax-wielding individual attacked four of our officers," New York City Police Commissioner William Bratton said Monday on "CBS This Morning."

Following this latest threat, an advisory was issued to NYPD officers urging caution and awareness.

"This one is also very specifically directed at law enforcement personnel, so we're encouraging officers that when they're on these fixed posts, that they be even more vigilant that they might ordinarily be," Bratton said. "They're there for a purpose, to protect that location, as well as to protect themselves and the public. So if both of them are sitting in the car and they're busy texting away or not paying attention of the surrounding area, they're much more vulnerable to attack."

The video details specific instructions for supporters to rise up and commit acts of violence, not only against law enforcement targets, but also civilians. Bratton said his biggest concern is that individuals are being radicalized by these terrorist groups to commit violent acts.

"They're continually working to attract new recruits -- not to go fight in Syria as much as to attract new recruits from around the world," Bratton said. "They're extraordinarily skilled with their public relations campaign, if you will - much more so than the traditional al Qaeda operatives."

On Sunday, Attorney General Eric Holder said on the "Face the Nation" that lone wolf terrorism and extremism keeps him up at night. While Bratton's department is working to combat these threats, he recognizes that there are many possible "soft" targets, like the Kosher market in Paris.

"So what's the old adage? You cannot protect everything. Anybody who attempts to is doomed to protect nothing," Bratton said. "So we do prioritize. We do through our intelligence services, we attempt to identity if there are threats sometimes publicly made, or other times covertly made, against specific locations and facilities."

Bratton noted the NYPD has over 1,000 personnel assigned to counterterrorism and intelligence units and other detectives who can be assigned to investigate.

"To surveil an individual on a 24 hour basis requires dozens of officers, because you don't want them to know that you're watching them. So you have to have rotating teams so that they don't get identified," Bratton said. "It's not easy to do, it's very labor-intensive. We're probably one of the few police departments in America that can do it because of the sheer size of the department."