Tzipi Livni sent US Secretary of State Hillary Clinton a letter of condolence on Saturday following the killing of 28 people, among them 20 children, in a shooting at an elementary school in Connecticut the previous day.
"Senseless violence has shown its ugliest face, since it struck at civilized society's most vulnerable spot, our young children. The human soul refuses to comprehend these images of bloodshed and grief," The Tzipi Livni Party leader wrote.
"On this fateful day when tragedy struck at the good people of Newtown, I grieve, along with my fellow Israelis, the loss of so many lives of innocent men, women and children. Our hearts go out to the families of the victims," she added.