BOSTON (AP) -- Hundreds of runners dressed like superheroes have raced down the final 18 miles of the Boston Marathon course, training for the world's oldest marathon a year after twin explosions killed three people and wounded more than 260 others.
Saturday's 300 charity runners include 24 members of Team MR8, named after 8-year-old Martin Richard. He was the youngest person killed when the explosions went off among people gathered near the marathon finish line last April 15.
Those chosen to run for Team MR8 include former Massachusetts State Police Sgt. Sean Murphy, who was disciplined after leaking dramatic photos of bloodied bombing suspect Dzhokhar Tsarnaev (joh-HAHR' tsahr-NEYE'-ehv) during his capture.
Murphy says he is honored to be running for Richard's legacy.