The Obama administration is cautiously welcoming the possibility of a temporary cease-fire in Syria, saying it hopes calm might lead to political transition.

Secretary of State Hillary Rodham Clinton says she supports U.N. peace envoy Lakhdar Brahimi's initiative and wants a transition process ending the Assad family's four-decade dictatorship.

Brahimi says Syria's government and some rebel leaders have agreed to the four-day truce during the Muslim Eid al-Adha holiday, which starts Friday. But an al-Qaida-inspired Islamist group rejected the call.

Clinton on Wednesday also condemned this weekend's attack in Lebanon that killed an anti-Syrian intelligence chief. She backed Lebanese efforts to reshape the government and find those responsible.

But Clinton said the U.S. doesn't want a political vacuum in Lebanon that can be taken advantage of by Syria or others.