An interfaith memorial service will be held for the victims of the Boston Marathon bombing Thursday morning at 11 a.m. ET. A live stream of the service can be seen below.

UPDATE: FBI Wants to Interview 2 Men in Boston Marathon Explosion

President Obama and First Lady Michelle Obama will be attending the memorial service which will be held at the Cathedral of the Holy Cross.

A joyous event turned into one of the most tragic days in the city of Boston on Monday, Apr. 15, when terrorists planted two simultaneous bombs near the finish line of the Boston Marathon.

Three victims were killed: 8-year-old Martin Richards, 29-year-old Krystle M. Campbell, and Boston University grad student Lu Lingzi lost their lives in the horrific bombings.

Up to 176 are injured and 17 remain in critical condition.

The first of two bombs went off near the finish line 4 hours and 10 minutes into the race, and the second blasted 12 seconds later, 550 feet apart. So far, over 140 people are confirmed injured and were rushed to area hospitals and treated at makeshift medical centers at the race, according to reports. Some of the runners lost their limbs and had to be amputated, including a 5-year-old girl who lost both of her legs, ABC News reported. One marathon runner lost both of his legs and was wheeled away calmly as his family surrounded him and were crying, according to New York Daily News.

President Obama addressed the nation in a press conference immediately after the attacks, saying: "We will find out who did this; we'll find out why they did this," said the president from the White House. "Any responsible individuals, any respon­sible groups will feel the full weight of justice."

A video believed to be a suspect dropping a duffel bag near has been captured by CCTV surveillance cameras near the Lord and Taylor department store in Boston.

However, suspect has not been identified as of yet, despite conflicting reporters yesterday.