Ooops, trying this linky to yahoo:
http://news.yahoo.com/secret-says-suspect-white-house-shooting-arrested-pennsylvania-190508465.html
Here is the link to WTAE in Pittsburgh. He WAS arrested in Indiana, PA:
http://wap.wtae.com/wap/news/text.jsp?sid=238&nid=3429559674&from=home