I offer up Scripture out of my Christian faith tradition as comfort:
The eternal God is your dwelling place, and underneath are the everlasting arms. ~Deuteronomy 33:27 (We are never alone.)
Blessed are those who mourn, for they will be comforted ~Matthew 5:4 (Jesus teaches us that God and caring humans will come to your aid and your comfort.)
Here's a prayer we can share together for those who died in this attack and plant blast, if you are so inclined:
Eternal Spirit, before whom the generations rise and pass away, even in the presence of death our first words to you are in praise for your unnumbered mercies. For the memory of loved ones now departed, we praise you. For their victories of character over trial, of courage over difficulty, of faith over sorrow, we give you thanks, and for all those who have done justly, loved mercy, and walked humbly with their God, we sing joyfully to you. Grant us now this same joyful thanksgiving as we remember our friend, and give to us that sure knowledge that you have won the victory over death in the resurrection of Jesus Christ. Amen
Here is comfort from Jesus Christ for all who were caught up in these events and are suffering. It is assurance that no one can remove you from Jesus' care ... no matter what despicable acts they may commit.
27My sheep hear my voice. I know them, and they follow me. 28I give them eternal life, and they will never perish. No one will snatch them out of my hand. 29What my Father has given me is greater than all else, and no one can snatch it out of the Father’s hand. 30The Father and I are one.” John 10:27-30
Finally, for comfort's sake, Psalm 23: