As Christians, one of our responses to crisis is prayer. We hope you will find these prayers helpful as we join with believers all over the world in lifting this tragic situation before God.
From the Book of Alternative Services (p. 677):
O God, it is your will to hold both heaven and earth in a single
peace. Let the design of your great love shine on the waste of
our wraths and sorrows, and give peace to your Church, peace
among nations, peace in our homes, and peace in our hearts;
through your Son Jesus Christ our Lord.
From the Book of Common Prayer (pp. 50 and 51):
ALMIGHTY God and merciful Father, who wouldest have the kingdoms of the world
become the kingdom of thy Son Jesus Christ: Bestow thy blessing, we beseech thee, upon all
who labour for peace and righteousness among the peoples [especially . . . ]; that the day may be
hastened when war shall be no more, and thy will only shall govern the nations upon earth;
through the same Jesus Christ our Lord. Amen.