they are serving search warrants on several properties around the philadelphia area to try to come up with anything there. as for the officer himself, while he survived, he did lose a lot of blood. he was shot almost point-blank in the arm breaking the bone in one place, a lot of nerve damage. a long way to go before he is back on the force and working, but just an unbelievable job he did, john. >> indeed. obviously our thoughts go out to him. such bravery, such presence of mind. miguel marquez, thank you so much. so what does this attack mean for law enforcement agencies across the country? cnn national correspondent deborah feyerick has been working her law enforcement sources, joins me right now. deb, we heard miguel say the new york police department sent out a warning saying be on alert right now. enormous concern i have to believe across the can you want. >> there really is. that's the whole thing. isis made very clear that law enforcement, with the military, that any related to government that could be a potential target and therefore everybody right now on high alert. the police commissioner was asked why the officer was alone in his vehicle, and he responded