Boston Marathon bombing anniversary – timeline
One year has passed since two bombs exploded in Boston, killing three people and injuring hundreds
TODAY marks the first anniversary of the Boston Marathon bombing, which killed two women and an eight-year-old boy and wounded than 260 people.
This year's race will be run on Patriots' Day, next Monday, while thousands of people posed by the marathon's finishing line on Saturday for a commemorative cover photo for Sports Illustrated.
Boston city officials are strengthening the security around this year's race to deter a repeat attack, with more cameras, more searches and more uniformed and undercover police officers.
On 15 April last year, Dzhokhar Tsarnaev, now 20, and his older brother Tamerlan, 26, are believed to have planted two pressure cooker bombs near the marathon's finish line.
Tamerlan died in a police shootout just days after the attack, while Dzhokhar faces 30 charges, including using a weapon of mass destruction and shooting a police officer dead. He could face the death penalty if convicted when his case goes to trial later this year.
Here are the events that led to Dzhokhar's arrest...