The city of Boston will hold a memorial this afternoon, one year to the day that two bombs ripped through the Boston Marathon.

Three people were killed and 264 more were injured.

Two brothers - Tamerlan Tsarnaev, 26, and Dzhokhar Tsarnaev, 19 - were identified as the bombers.

Vice President Joe Biden, Massachusetts Governor Deval Patrick, and former Mayor Tom Menino will be among dignitaries who will honor the victims.

A flag-raising ceremony and moment of silence will be held at the marathon finish line between 2:30 p.m. and 3 p.m.

President Barack Obama will hold a moment of silence at the White House at 2:49 p.m., the same time the two bombs exploded.

The 2014 marathon will draw over 36,000 runners, the second-largest in history. It will take place Monday, April 21st.

ABC News will carry the memorial ceremony live. George Stephanopolous will anchor from New York.