Hundreds of Americans remain missing two days after devastating tsunamis struck Asia, but the State Department says a large number have been located and are safe. Responding to the disaster, the U.S. Agency for International Development added $20 million to the already promised $15 million. The State Department said Tuesday that 12 Americans had died, seven in Sri Lanka and five in Thailand. Bush administration officials sought to allay concerns about the missing, saying it might simply be a matter of not getting in touch with U.S. authorities in Asia. Still, the State Department deputy spokesman Adam Ereli told reporters, "I would not presume to tell you that the casualty figure we have today is final. We just don't know." The aid announcement was made after director Anthony S. Natsios met with Secretary of State Colin Powell and Deputy Secretary Richard Armitage.