BOSTON, Mass. (WLNE) — Tuesday marks 12 years since the deadly Boston Marathon bombing that killed three people and wounded hundreds when powerful explosives were detonated near the finish line in 2013. Eight-year-old Martin Richard, 29-year-old Krystle Campbell and 23 year old Lu Lingzi were k illed. MIT police officer, 27-year-old Sean Collier was killed days later during a manhunt for bombers. The city honored victims and survivors Tuesday in Boston. Every year, Boston marks the day by encouraging acts of charity and kindness. There will be a bell ringing and moment of silence at the Old South Church at 2:49 p.m. The city is also hosting several service projects. This year, about 30,000 runners are participating in the April 21 race. Another half-million spectators are expected along the route. A bulletin obtained by ABC News said law enforcement officials are not aware of any specific or credible threats to high profile attendees of the Boston Marathon. Categories: Massachusetts, News ...read more read less