A Revere, Mass. police captain holds his cap while entering a memorial service for fallen Massachusetts Institute of Technology police officer Sean Collier, in Cambridge, Mass., Wednesday, April 24, 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)

Boston area honors slain MIT officer

As bagpipes wailed, more than 4,000 mourners paid their respects Wednesday to an MIT police officer who authorities say was ambushed in his …

Suspicious Letters

2nd Miss. man investigated in ricin case

Law enforcement officials searched the home of a second Mississippi man in connection to ricin-laced letters sent to the president and a U.S…