Well, they are looking into a seemingly suspicious inspection that may be tied to it…
http://www.reuters.com/article/newsOne/idUSN0730857020080307
U.S. authorities are checking whether several people stopped at the Canadian border are linked to an explosion that damaged a military recruiting station in New York, police said on Friday.
“Some pictures of Times Square, including the recruiting station, were found,” New York Police Commissioner Ray Kelly told CNN. “So federal officials are going back to take another look and talk to Canadian officials about that stop.”