BEIRUT, Lebanon - Lebanon's defense minister said Sunday he is certain Hezbollah will not break the cease-fire but warned all militant groups of harsh measures and a traitor's fate if they incite Israeli retaliation by firing rockets into the Jewish state.

Defense Minister Elias Murr's strong remarks indicated concern that Syrian-backed Palestinian militants might try to restart the fighting by drawing retaliation from Israel.

Prime Minister Fuad Saniora, meanwhile, toured the devastated Hezbollah stronghold in south Beirut and decried the destruction by Israeli bombs as a “crime against humanity.”

Parliament Speaker Nabih Berri, a Shiite and Hezbollah backer, stood at the Sunni premier's side and said they spoke with one voice.

In Jerusalem, Israeli Prime Minister Ehud Olmert said he would name a panel to investigate the military and government's performance during the war, which has been criticized by many Israelis as weak and indecisive.

A day after Israeli commandos staged a pre-dawn raid deep into Lebanon, prompting U.N. Secretary-General Kofi Annan to declare the Israelis in violation of the Security Council cease-fire resolution, no new clashes were reported.