"I'm extremely concerned that if you leave Gaza in the state it's currently in, you'll have a**ther eruption, and violence, and then we're back in a further catastrophe, so we've got to stop that," he said. Blair was making his first trip to Gaza since the July-August war between Israel and the territory's Islamist rulers Hamas. The United Nations has been taking efforts to speed up the delivery of material to rebuild damaged homes, with officials saying the pace has picked up after a slow start. "So 20 years after Oslo we need a new approach to Gaza and a new approach to peace," Blair said.