As Boston buries its dead, more evidence gathered - Article Photos 26/26

Mourners enter St. Patrick's Church in Stoneham, Mass., before a funeral Mass for Massachusetts Institute of Technology police officer Sean Collier, Tuesday, April 23, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible. (AP Photo/Steven Senne)