Boston Marathon

Officer Sean Collier was killed during an encounter with the Tsarnaev brothers who were responsible for the bombing

A six-year push for the day of appreciation, inspired by heroism and tragedy, culminated in the designation of Oct. 28 to honor first responders

A special task force has been created for the event and is comprised of officers from as far away as Alaska

A chief shares her memories of attending the funeral of MIT Police Officer Sean Allen Collier who was killed in the line of duty by the Boston Marathon bombers

The announcement came just hours after a shooter wounded 10 on a subway train in Brooklyn; there is currently no "credible threat," officials say

Sgt. Jeffrey Pugliese came face to face with the bombers in a gunfight in 2013

The justices agreed to hear an appeal filed by the Trump administration

Three stone pillars representing the three people who died at the race's finish line were installed Monday, marking the final step of the $2 million project

A sanitation truck, snow removal equipment or public works vehicle are moveable barriers that can harden mass gatherings from vehicle terror attacks and other threats

Five years made a world of difference to first responders on the ground in Boston on race day

An LEO who died a year after he was wounded in a confrontation with the bombers has been promoted

From a very early age, Officer Dennis “D.J.” Simmonds wanted to be a hero

Crowdsourcing video and other digital media for evidence in investigations has played a key role in solving cases

There will be short and long-term effects that are physical, emotional and psychological

Controversy over "Patriots Day" is just the latest chapter in a family’s years-long push for their son to be honored and recognized as the Boston bombing's 5th victim