The U.S. planes have also begun a campaign of dropping leaflets over Afghanistan to try to explain to civilians that the United States is a friend. The leaflets - in the local languages of Pashtu and Dari - were added Sunday to the drops being made of humanitarian food packets.
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In addition, Rumsfeld said that the United States is seeking to forge ties with the anti-Taliban forces of the Northern Alliance, though he was sketchy about its status.
"That process is going forward, and it is still incomplete, if you will," he said.
Pentagon officials have said that the bombing campaign, now in its second week, is meant to set the stage for follow-up action, which is expected to involve ground forces. Northern Alliance leaders have said they have linked up with British and U.S. commando forces in the region.
U.S. officials have refused to describe the nature or timing of any future combat actions in Afghanistan. But President Bush seemed to look ahead yesterday to a new, more complex phase in the U.S.-led offensive when he spoke at a welcoming ceremony for the new chairman of the Joint Chiefs of Staff, Air Force Gen. Richard B. Myers.
"For the mission that lies ahead, you will have everything you need," he said of service members. "Every resource, every weapon, every means to assure full victory for the United States, our allies, our friends, and the cause of freedom."
The U.S. air assaults yesterday, which were followed by nighttime raids, were the biggest daylight attacks so far over Afghanistan. The USS Theodore Roosevelt joined three aircraft carriers already in the region.
In the meantime, the United States is waging an intensive public relations effort to win the support of Afghan civilians and Muslims in such countries as Pakistan who have voiced anger over the U.S. attacks. That effort includes dropping the leaflets and sending Bush's national security adviser, Condoleezza Rice, to sit for an interview yesterday with Al-Jazeera, the Arab satellite news station.
In the interview, Rice said: "We want it to be very clear that the war on terrorism is not a war against Islam. Islam is a peaceful religion. Islam is a religion that respects innocent human life."
One of the leaflets dropped yesterday shows a Western soldier in camouflage and helmet shaking hands with a man in traditional Afghan dress in front of a mountain scene.
"The partnership of nations is here to assist the people of Afghanistan," the leaflet states.
Over the weekend, more than 68,000 food packets were dropped, bringing the total to 275,000 since the effort began.
"This is bringing needed food to hungry Afghan people, as well as a message of friendship from the American people," Rumsfeld said.
The defense secretary said that the bombing targets are being expanded on a day-by-day basis as military planners cross some off the list and add others.
"The target [plan] that existed at the outset has been significantly enhanced by additional information from the ground," he said. "As a result, the number of targets that are available have continued to be roughly the number that they were the day before."
Rumsfeld sharply disputed Taliban government reports that the U.S. bombing has killed hundreds of civilians. He asserted that "some of the numbers [claimed] are ridiculous" and that the "Taliban leadership and al-Qaida are accomplished liars."
Without offering an estimate, Rumsfeld acknowledged that some Afghan civilians have been unintended casualties of the strikes. "I don't think there is any way to avoid that" in a war, he said.