Saturday marks the 19th year since the bombing of the Alfred P. Murrah Federal Building in Oklahoma City.

The Oklahoma City National Memorial will hold a 19th Anniversary Remembrance Ceremony, starting at 8:55 a.m. tomorrow, according to the memorial’s website,

“As in years past, 168 seconds of silence will be observed at 9:02 a.m., reflecting the moment we were all changed forever 19 years ago,” the website reads. “Family members and rescue workers are part of this year’s ceremony which will conclude with the traditional reading of the 168 names of those who were killed.”

The bombing, an act of domestic terrorism, occurred the morning of April, 19, 1995. The massive explosion killed 168 people and injured nearly 700. Timothy McVeigh was later convicted of federal murder charges for the bombing and executed. According to the memorial’s website, McVeigh parked a rental truck with explosives in front of the building. At 9:02 a.m., he detonated the bomb and “a massive explosion occurred which sheared the entire north side of the building, killing 168 people.”

Terry Nichols, a co-conspirator in the bombing, was convicted in 1997 and sentenced to life in prison without the possibility of parole.