Boston remembers marathon bombing victims, one year on

People look at a make-shift memorial on Boylston Street in this April 20, 2013 file photo, near the scene of the Boston Marathon explosions as people get back to their normal lives the morning after the capture of the second of two suspects wanted in
People look at a make-shift memorial on Boylston Street in this April 20, 2013 file photo, near the scene of the Boston Marathon explosions as people get back to their normal lives the morning after the capture of the second of two suspects wanted in the Boston Marathon bombings. -- PHOTO: AFP
Jamal Alkattan pins down a corner of a memorial quilt prior to a flag raising ceremony at Boston Medical Centre to commemorate the one year anniversary of the Boston marathon bombings on April 14, 2014 in Boston, Massachusetts. -- PHOTO: AFP
Jamal Alkattan pins down a corner of a memorial quilt prior to a flag raising ceremony at Boston Medical Centre to commemorate the one year anniversary of the Boston marathon bombings on April 14, 2014 in Boston, Massachusetts. -- PHOTO: AFP
People walk past an electronic billboard reading "Boston Strong" near the finish line of the Boston Marathon, on April 14, 2014 in Boston, Massachusetts. -- PHOTO: AFP
People walk past an electronic billboard reading "Boston Strong" near the finish line of the Boston Marathon, on April 14, 2014 in Boston, Massachusetts. -- PHOTO: AFP
Crosses bearing the names of people killed are displayed in an exhibit titled, "Dear Boston: Messages from the Marathon Memorial" in the Boston Public Library to commemorate the 2013 Boston Maraton bombings, on April 14, 2014 in Boston, Massachusetts
Crosses bearing the names of people killed are displayed in an exhibit titled, "Dear Boston: Messages from the Marathon Memorial" in the Boston Public Library to commemorate the 2013 Boston Maraton bombings, on April 14, 2014 in Boston, Massachusetts. -- PHOTO: AFP
Runner's shoes are laid out in a display titled, "Dear Boston: Messages from the Marathon Memorial" in the Boston Public Library to commemorate the 2013 Boston Maraton bombings, on April 14, 2014 in Boston, Massachusetts. -- PHOTO: AFP
Runner's shoes are laid out in a display titled, "Dear Boston: Messages from the Marathon Memorial" in the Boston Public Library to commemorate the 2013 Boston Maraton bombings, on April 14, 2014 in Boston, Massachusetts. -- PHOTO: AFP
The New York Times photographer Josh Haner's image of Jeff Bauman is shown in this picture provided by the New York Times, which was part of his Pulitzer prize winning entry for feature photography announced by Columbia University in New York on Apri
The New York Times photographer Josh Haner's image of Jeff Bauman is shown in this picture provided by the New York Times, which was part of his Pulitzer prize winning entry for feature photography announced by Columbia University in New York on April 14, 2014. -- PHOTO: REUTERS 
The New York Times photographer Josh Haner's image of Jeff Bauman is shown in this picture provided by The New York Times which was part of his Pulitzer prize winning entry for feature photography announced by Columbia University in New York on April
The New York Times photographer Josh Haner's image of Jeff Bauman is shown in this picture provided by The New York Times which was part of his Pulitzer prize winning entry for feature photography announced by Columbia University in New York on April 14, 2014. -- PHOTO: REUTERS
Jillian Munson, from Rochester, New York, hangs a hand-written message she wrote on a tree hung with messages inside a display titled, "Dear Boston: Messages from the Marathon Memorial" in the Boston Public Library to commemorate the 2013 Boston Mara
Jillian Munson, from Rochester, New York, hangs a hand-written message she wrote on a tree hung with messages inside a display titled, "Dear Boston: Messages from the Marathon Memorial" in the Boston Public Library to commemorate the 2013 Boston Maraton bombings, on April 14, 2014 in Boston, Massachusetts. -- PHOTO: AFP

BOSTON (AFP) - One year after the deadly Boston Marathon bombings, the north-eastern US city on Tuesday will pay solemn tribute to the victims of the grisly attack that stunned the nation.

The solemn ceremonies will take place at the scene of the carnage at one of the world's nation's sporting events - in the heart of the city, on Boylston Street.

Church bells will toll at 2:49pm, the moment the first bomb exploded at the race's finish line on April 15 last year.

The two pressure-cooker devices allegedly planted by two brothers of Chechen descent, who had lived in the United States for years, sent metal fragments flying through the crowd, killing three people and wounding more than 260 others. Several people lost limbs.

Dzhokhar Tsarnaev, who is now 20, and his 26-year-old brother Tamerlan were identified thanks to pictures and video footage and eventually cornered by police after a four-day manhunt that paralysed the city of nearly one million.

Tamerlan died after an exchange of fire with police, and Dzhokhar was wounded and captured. The younger Tsarnaev, a naturalized US citizen, will go on trial in November and could face the death penalty if convicted.

US Vice President Joe Biden, Massachusetts governor Deval Patrick, Boston mayor Martin Walsh and his predecessor Tom Menino - who was in office at the time - will speak at the event at the Hynes Convention Centre, along with survivors.

Tuesday's tribute ceremony "will honour those affected by last year's events, including those who lost lives, survivors, and first responders," organizers said.

There will be a flag-raising ceremony and a moment of silence will be observed at the race's finish line.