The Catholic Diocese of Brownsville said Sister Leticia Ugboaja was detained by agents as she was walking to attend mass at Our Lady of Sorrows Church in Texas.
The Archdiocese of Newark said it is seeing record-high attendance.
Pope Leo XIV has urged a ceasefire in the Middle East and called on leaders in the Iran war to reopen talks.
Two religious leaders have been named the new chief chaplains of the New York Police Department: Cardinal Timothy Dolan, retired Archbishop of New York, and Reverend A.R. Bernard, pastor at Christian Cultural Center.
Catholics receive ashes on their foreheads in the shape of a cross as a reminder that death is part of life on Ash Wednesday.
The officiant typically says, "Remember that you are dust, and to dust you shall return," a stark reminder that death is part of life and that one should focus on things of the spirit.