Boston police marched in formation to circle the Cathedral of the Holy Cross before the interfaith service on April 18 to honor the victims of the Marathon bombings. Special guests include President Obama, who was expected to speak, and cellish Yo-Yo Ma, who was expected to perform.

Read more.

Mayor Thomas M. Menino passed President and Michelle Obama during the service. Menino stood up despite a broken leg to address the crowd on Boston’s resilience.

People attended the "Healing Our City: An Interfaith Service" dedicated to those who were gravely wounded or killed in the Boston Marathon bombing.

President and Michelle Obama attended an interfaith healing service at the Cathedral of the Holy Cross in Boston for victims of Monday's Boston Marathon explosions.

People waited for the start of the service at the Cathedral of the Holy Cross following the Marathon bombings.

Former Massachusetts governors Jane Swift and Mitt Romney greeted each other before the service.

Marathon runner Nathan Finney of Boston and his daughter Mckenna, 5, gathered with others ahead of an interfaith service.

The cathedral holds some 2,000 people; about half the seats will be reserved for invited guests, organizers said, including victims’ families, first responders, medical personnel, government officials, and volunteers from the Boston Athletic Association

People embraced in the Cathedral of the Holy Cross before the president's visit.

Representive Edward Markey greeted President Obama as he arrived at Logan Airport to attend the service.

Boston police officers rode bicycles outside the Cathedral of the Holy Cross where President Obama was scheduled to attend an interfaith service.

Cellist Yo-Yo Ma warmed up prior to the services.

Police officers waited for the service to start at the Cathedral of the Holy Cross.

Titled “Healing Our City,” the service will include readings, prayers, and reflections from clergy of different faiths.

“Our city needs prayer,” said Lorri Miner of Quincy who was outside of the cathedral.

People waited in line outside to get one of the first come, first served tickets available to the public.

Security barriers were set up in front of the Cathedral of the Holy Cross.

Daughters of Mary of Nazareth ate doughnuts while waiting in line for free tickets.