After the Palestinian militant group Hamas' weekend attack on Israel, Israel has bombarded and laid siege to the Gaza Strip, controlled by Hamas, and plans a ground invasion. There have been reports of harassment and assaults of both pro-Israel and pro-Palestinian students, deepening grief and putting students of all political stripes on high alert. In a sign of the tensions, some counter-protesters at Columbia shouted angrily at the pro-Palestinian group. Many faulted the university for not expressing more support for Palestinian students and the people of Gaza. Tensions sparked anew at campuses on Thursday as the national group Students for Justice in Palestine (SJP) declared a "day of resistance," with demonstrations by its 200 chapters at colleges across North America.

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Persons: tensely, Israel, David Hidary, SJP, Gabriella Borter, Joseph Ax, Andrew Hay, Paul Thomasch, Cynthia Osterman Organizations: Columbia University, Israel, New, Hamas, Kan, Columbia, Palestine, Palestinian, REUTERS, Harvard University, Harvard Crimson, Students for Justice, Defamation League, Justice, University of Arizona, University of California Los, Georgetown University, Washington , D.C, Thomson Locations: New York City, Israel, Gaza, U.S, Palestine, North America, Hamas, Tucson, University of California Los Angeles, Washington ,, Washington, New York, Taos , New Mexico