They arrested someone at the Westin, and bomb sniffing dogs picked up a scent.
They have also arretsed a man in Providence that was on an Amtrak train from Boston.
http://www.thebostonchannel.com/news/957448/detail.html
Here is a link and on the main page is a picture of the guy in custody.
I also observed not only military aircraft, but I believe a commercial jet around 1pm. There were reports that the airlines were going to move plane around the country to get ready for the re-opening of the nations airports.