attributing this, doing it in the name of isis. law enforcement is saying they believe he acted alone. but they are investigating this as an act of terror on the streets of new york city. alex? christine? >> jean, we do know that he is still alive, and that is in fact rare after attacks like this. do we know what kind of conversations he's had with the authorities, what if anything he has told the authorities? >> reporter: no. we just know that before surgery law enforcement were able to talk with him. and remember, in the law there is something as a safety exception, that when there is an act of terror if it's believed others could be associated with, there's harm that could come to other citizens in the country, that they are able to question a suspect without an attorney present because of that public safety concern. we do know they spoke with him. we don't know if he responded and what he said, if he said