Three days after tragedy struck Boston, President Barack Obama offered a message of solidarity and reslience today when he spoke an interfaith memorial service held for the victims of the marathon bombing.

Obama, who attended law school at Harvard University in Boston, reflected on a place that was once his home.

“We join you in saying, Boston is my home. For millions of us, what happened on Monday is personal,” he said.

The service, “Healing Our City: An Interfaith Service” held at the Cathedral of the Holy Cross, honored the three killed and more than 170 people injured by the two bomb explosions near the finish line of the annual race.

Boston Mayor Thomas Menino and Massachusetts Governor Deval Patrick also spoke at the service. They both assured that Boston would “repair,” and the race will be held next year.

President Obama received a standing ovation from the packed cathedral after reiterating this message. He said that Americans can “bet on” the return to the city to “run harder than ever and cheer even louder” next year at the 118th Boston Marathon.

“We may be knocked off our feet, but we will keep going. We will finish the race,” Obama said.

While there have been no arrests made as of yet, the President promised that those involved will “feel the full weight of justice” in his address to the nation Monday afternoon.

“We will find whoever harmed our citizens and we will bring them to justice,” Obama said.