But the day will mark five years since two homemade bombs were detonated 12 seconds and 210 yards apart as participants were crossing the finish line.
The Boston Marathon bombing was a horrific act of terrorism committed by Islamic extremists on US soil.
When was the Boston Marathon bombing? How many victims were there and what actually happened?
Three people were killed and several hundred were injured during a shocking bomb attack at the Boston Marathon in 2013.
The bombings took place on Monday, April 15, 2013 near the finishing line of the annual marathon in the city.
The marathon is always held on the third Monday in April to coincide with the Patriots’ Day, which celebrates the first battles of the American Revolutionary War.
Three spectators, including an eight-year-old boy, were killed and more than 260 people were also injured, with 16 losing limbs.
The bombs were packed with nails, ball bearings and other shrapnel.
The FBI released images of two suspects on April 18, who were later identified as Kyrgyz-American brothers Dzhokhar Tsarnaev and Tamerlan Tsarnaev.
During a police chase of the pair, an MIT policeman was killed by the brothers, and a man was kidnapped in his car.
A shootout ensued between the police and the suspects, which resulted in two officers being seriously injured – one of whom died a year later.
Tamerlan Tsarnaev was shot a number of times and then run over by his brother while he was escaping in the stolen car.
The 26-year-old died shortly after.
A manhunt began to find Dzhokhar Tsarnaev, 21, with thousands of law enforcement officers searching the Watertown area.
A resident discovered him later that evening hiding in a boat in his backyard and he was shot and wounded by police before being taken into custody.
Dzhokhar claimed during questioning that he was following his brother’s lead after they were motivated by extremist Islamist beliefs and the wars in Iraq and Afghanistan.
He told police they learned to build explosive devices from an online magazine of the al-Qaeda affiliate in Yemen.
He also revealed they had planned to travel to New York City to bomb Times Square.
Dzhokhar was convicted of 30 charges on April 8, 2015, including the use of a weapon of mass destruction and malicious destruction of property resulting in death.
He was sentenced to death two months later but has yet to be executed.