Israeli tanks and bulldozers have rolled into Gaza City, flattening three buildings and leaving two Palestinians seriously injured. They destroyed a police post and two metal workshops, in what was the second operation to be carried out in the Gaza Strip in three days. Israel has been roundly condemned by Western and Arab nations alike for an air strike on Gaza City on Monday night which killed 15 people, including nine children. In the latest operation, tanks and a bulldozer pushed their way into the city and flattened a small Palestinian military intelligence position as well as a metal workshop, before blowing up another workshop in a blast across the city. The Israeli military alleges that metal workshops are potential explosive factories. It said that the incursion followed the firing of a rocket into the country by Palestinians on Tuesday. It caused no casualties.