"For those who lost their lives, we pray for their eternal rest and God's strength to their loved ones left behind; for those who are wounded, we pray for their health and healing," he said.
In a Dec. 2 statement, the bishop called on people to pray for "all of the victims of this horrific incident and their families" and also asked for prayers for law enforcement officers who at the time were still "pursuing the suspects in this case."
"Our community of San Bernardino has faced great challenges through the years. Let us come together now in unity to bring light to the darkness of this day," Barnes said.
The shooting took place at the Inland Regional Center, a state-run facility for individuals with developmental disabilities where county health officials were having an employee holiday party.
Two armed suspects — later identified as Syed Farook, 28, and Tashfeen Malik, 27 — were killed by police four hours later in a shootout about three km from the social services centre.
Farook, a county environmental inspector, had attended the holiday party and left, returning with Malik, wearing "assault-style clothing" with ammunition attached, according to police. At a Dec. 3 news conference, police were also saying Farook had been “radicalized” and had recently travelled to Saudi Arabia and Pakistan.
Police and federal agents have not yet offered a motive for the couple's shootings at the centre, which provides housing and work programs, and therapy and social services to more than 30,000 people with developmental disabilities. They have not confirmed that it was a terrorist act, but they have also not ruled it out as the investigation continues.
"Today, yet another American community is reeling from the horror of gun violence," said House Minority Leader Nancy Pelosi in a Dec. 2 statement.
"As the families of the victims grieve and the survivors focus on healing, the entire American family mourns.”
Pelosi noted that gun violence is "a crisis of epidemic proportions in our nation" and said Congress has a moral responsibility to vote on common sense measures to prevent the daily agony of gun violence in communities across America. Enough is enough."
Philadelphia Archbishop Charles Chaput said "each innocent life lost" in the shooting was precious. "Each was intimately connected through family and friendship to many others, who now survive them and bear a burden of unearned suffering."
The archbishop, in a Dec. 3 statement, added: "Pursuing justice in this matter is in the hands of law enforcement. Our task as Christians is to pray for those persons whose lives were ended by the inexcusable cruelty of others."