It looks like Israel's next move will be on the ground. The country has massed tanks along the Gazan border, called up reservists, and declared Gaza a "closed military zone," meaning civilians, including journalists, could be denied access to an area up to two miles from Gaza. A military spokeswoman said the establishment of the zone was not to hide anything but to protect civilians from Hamas, which she said may use suicide bombers and missiles. Anger in the Arab world, meanwhile, is heating up, much of it directed at Egypt for sealing its border with Gaza. In gunfire between Egyptian border guards and Palestinians, at least one guard and one Palestinian were killed. The death toll so far has climbed over 300. The United Nations estimated that at least 51 civilians have been killed.