Israel has begun firing artillery shells into the northern Gaza Strip in an intensification of its five-day offensive. Haaretz reports this marks the first time Israel has used cannons against targets in the Gaza Strip since the 1967 Six Day War. Much of Gaza City is now without power after a series of Israeli air strikes. Haaretz reports a missile struck a building used by the ruling Fatah party to provide tutoring lessons to school children, and cash and food assistance to families. Israel has justified the attacks saying they are needed to stop Palestinians from firing rockets into Israel. Meanwhile in the West Bank, Israel has shut down and sealed 15 offices of different social welfare organizations claiming they are funneling funds to families whose members were killed in suicide bombings or were jailed in Israeli prisons. And over 400 Palestinians have been arrested in recent days.