The moment of silence was observed and the bells of the Old South Church were rung to mark the exact time the first bomb exploded.
Earlier this afternoon, Massachusetts Gov Charlie Baker and Boston Mayor Marty Walsh joined forces with the bombing victims' families by putting ceremonial wreaths near the marathon line.
In 2013, two bomb blasts close to the target marathon marathon marathon, which fell on April 15 that year.
In addition, the two men identified as bombs shot and killed MIT police Sean Collier days afterwards.
The attacks created a fatigue of local support and resilience that became known under the hashtag #BostonStrong.
Two years after the attacks, the city officially mentioned Boston on April 15, a Boston day, which marked it as a day to encourage acts of kindness and goodwill.
"Perhaps we trust the idea that we need life-changing situations to make friendliness. Them does not have to be displayed in random actions but with kindness and purpose. Kindness is an important part of efforts to promote a peaceful and only region, nation and global Communion.
"Kindness supports human dignity and should be shared freely, neighbor to neighbor, blocking until everyone is known as much," he said.
Baker, police department in Boston and rep. Joseph Kennedy III were among the politicians and organizations who presented memorials to the victim.
CNN's Amanda Jackson contributed to this report.