A local TV news mentioned there was a call to the rectory during the noon mass. I watched their live feed and saw a line of state police, heavily armed, with riot shields, go towards the church.
http://www.wfsb.com/category/216668/wfsb-eyewitness-news-livestream-1
Just now those police are walking away from the church, so it seems close to being resolved, whatever happened.
S.W.A.T. team just left the area.
My guess? A prank bomb threat.