An American survivor of Friday's bombing in Kenya arrives at Andrews Air Force Base Wednesday

In this story:

• Search for suspects
• Movement at terrorist camp in Afghanistan 'interesting'
• U.S. rejects allegations Marines ignored Kenyan victims
• Related stories and sites

WASHINGTON (CNN) -- Six American survivors of Friday's bombing at the U.S. Embassy in Kenya arrived at Andrews Air Force Base on Wednesday, following a flight from Ramstein Air Force Base, Germany.

Foreign Service officers undaunted by bombings Mideast, African embassies tighten security after bombings Protecting embassies difficult ... and probably impossible U.S. victims in Friday's bombing in Nairobi, Kenya Chronology of attacks on U.S. targets Image gallery Message board: Africa explosions

The six were met by Undersecretaries of State Thomas Pickering and Bonnie Cohen. They were to be treated briefly at Andrews' Malcolm Grove Medical Center and then moved to Walter Reed Army Hospital.

More than 5,000 people were injured in twin acts of terrorism Friday -- nearly simultaneous explosions at the embassies in Nairobi, Kenya, and Dar es Salaam, Tanzania. The death toll reached 253 by the time the search for victims and survivors was called off Wednesday.

Twelve of the dead are Americans, and Secretary of State Madeleine Albright will accompany 10 of the bodies back to the United States Thursday morning. One of the remaining two has already been flown back to Dover Air Base in Delaware, and the other, who was married to a Kenyan, will be buried in Kenya. All 12 died in the Kenya blast.

Albright arrived in Germany late Wednesday, where she visited injured Americans and Kenyans at a military hospital in Landstuhl.

Search for suspects

As the search for survivors and victims ended, the search for clues intensified. Around midday, crews pulled off the embassy wall the charred remains of a vehicle that may have carried the Kenya bomb, a U.S. official speaking anonymously said.

Both Tanzanian and Kenyan officials said they had detained a number of people for questioning about the blasts -- in Tanzania, 14 people were originally held, but one was released when his identity was established.

The office of Kenyan President said Wednesday that "a number of persons have been detained in relation to this incident and are providing useful leads in the circumstances surrounding the bomb blast."

But a senior law enforcement official in Washington said that none of the detainees "look promising."

Several claims of responsibility have been issued since the bombing, but none have been verified. National security officials were briefed on movements at terrorist base camps operated by Middle East financier Osama Bin Laden immediately after the African bombings, U.S. sources told CNN.

There was "a dispersement of people away from Bin Laden's bases of operation within Afghanistan in the aftermath of the explosions," a U.S. official said.

The official, who asked not to be named, estimated "scores" of people evacuated the remote mountain camps, which he described as known terrorist training facilities. A second official familiar with the reports said the United States found the mass departure from the compounds "interesting."

While no one contacted by CNN on this matter would say this movement was "evidence" of his involvement in the attacks, some said it added more weight to such a scenario since Bin Laden is a known terrorism sponsor who issued an open threat against the United States this past spring.

A soldier lays a wreath during a memorial service for victims Wednesday

In the aftermath of the explosions and rescue efforts, the United States battled back against allegations that Americans ignored Kenyan victims of the blast in favor of their own. Kenyan newspapers and some local rescue workers made the charges, particularly pointing the finger at U.S. Marine guards at the embassy.

"I think it's unfortunate," a state department official said. "The people of Kenya and the people of the United States were both victimized by a cowardly and callous attack."

The official said that the United States has "shared our resources with the people of Kenya, with the people of Tanzania, and we've applied the resources to where they could best be used without regard to people's color of skin or the color of passport they possess."

Reuters and The Associated Presscontributed to this report.

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