Defense Secretary Gates said Tehran was not close to having a bomb. A new report in which senior advisers to Obama participated urges further sanctions.
The UN headquarters in Gaza was struck by Israeli fire. Fissures are emerging among Israeli civilian and military leaders over how and when to end the campaign.
Hamas and Israel say they are weighing an Egyptian proposal for a cease-fire as international calls to end the conflict mount.
The conflict in the Gaza Strip is already having an impact on the political landscape in Israel ahead of parliamentary polls in February.
John McCain leads Barack Obama by 12 percent in one Israeli poll, a reflection of security concerns.
Foreign Minister Tzipi Livni won the Kadima Party primary to replace Ehud Olmert who has been beset by corruption charges.
Ehud Olmert's announcement on Wednesday night to cede leadership in September could spur a party shake-up and a shakier peace process.
Critics say the deal, which they see as lopsided, could embolden Hezbollah.
Women are believed to be carrying out attacks to avenge the deaths of loved ones, counter depression, or atone for previous actions.
The temporary cease-fire deal bids to end attacks from Gaza militants and the Israeli army and improve life in the impoverished coastal strip.