The United Nations said on Sunday the week-old truce between Israel and Hizbollah could easily collapse again into "an abyss of violence and bloodshed" if the UN resolution which engendered it was violated further. Senior UN envoy Terje Roed-Larsen said the truce provided the Lebanese government with a good chance to extend its authority over the entire country but warned: "We are at the tilting edge still.""This can easily start sliding again and lead us quickly into the abyss of violence and bloodshed," he told a news conference in Beirut before heading to Israel. Roed-Larsen said any further, similar raids by the Israelis would only discourage countries from committing troops to a planned UN peacekeeping force in south Lebanon. "What we have to do now is for all parties concerned to show utmost restraint to produce a situation that is so stable that troop contributors will come forward to hopefully reach the goal of 15,000 ...," he said.