Organizers of the London race have vowed to press on with the event on Sunday and are working closely with Metropolitan Police officials to increase safety checks in the hopes of preventing a similar tragedy.
Prince Harry is booked to present medals to the top runners at the end of the race and a spokesperson for the young British royal has confirmed he will still be in attendance.
The representative tells Eonline.com, "We announced last week that Prince Harry would attend this year's London marathon in his capacity as Patron of the London Marathon Charitable Trust, and that he would make the presentations to the winners and meet a selection of volunteer and support staff. As things stand we are not aware of any changes to that plan but ultimately we will be directed by the Race organizers."
Meanwhile, Welsh opera singer Katherine Jenkins insists the Boston bombings have spurred her on to compete in the run as planned.
Taking to Twitter.com, she writes, "Want to let you know that I will definitely still be running the London Marathon on Sun. I'm determined now more than ever PrayForBoston".
At least three people died and more than 150 were injured, many of them seriously, when two huge explosions ripped through a crowd of spectators watching the Boston Marathon in Massachusetts on Monday.
New Kids on the Block star Joey McIntyre was among the estimated 20,000 runners taking part in the annual event, but he escaped the brunt of the carnage after crossing the finish line just 11 minutes before the bombs went off.
Local stars Ben Affleck, John Krasinski, Dane Cook and Chris Evans are among the celebrities who have expressed their horror at the attacks, which are being probed by agents at the Federal Bureau of Investigation (FBI) as an act of terrorism.
Authorities have yet to name any suspects in the case.