The Orthodox Church in America has a special page on its website with materials to aid in prayerful remembrance of the events of September 11. The following petitions from the site are for use in Memorial services for the departed victims.

Again we pray for all who have fallen into the hands of our enemies: for the
children, the aged, and the sick; for prisoners of war and for all those whom our
enemies have killed and injured through terrorist attacks; that the Lord our God
may look upon them with compassion; that He may comfort, strengthen, and
preserve them; and that He may deliver them speedily from bondage and
oppression and have mercy on them.

Again we pray for the repose of the souls of the valiant people of God who have
departed this life: especially for the souls of all those who lost their lives during
the terrorist attacks.

Again we pray for our relatives and friends who continue to mourn and to grieve
the loss of their loved ones; that the Lord our God will grant them His peace and
consolation.

Again we pray for those who serve in the Armed Forces of our nation on land and
sea and in the air; that the Lord our God may bring them safely out of every peril
and danger and ever sustain them with the comfort of His mercy.

Again we pray that we may be preserved from wrath, pestilence, earthquake,
flood, fire, the sword; from invasion by foreign enemies, from terrorist attacks,
from civil war, and from sudden death; and that our God, Who is good and the
Lover of Mankind, may be gracious, merciful, and easy to be reconciled to us, so
that He may turn away from us the storm of wrath and affliction stirred up against us;
that He may deliver us from the righteous judgment impending against us; and
that He may have mercy on us.