NAIROBI, Kenya (CNN) -- The Kenyan government is making an international appeal for specialized medical help and supplies to deal with the aftermath of Friday's devastating bomb blast outside the U.S. Embassy in Nairobi.

In a dramatic rescue Saturday, a man trapped under the rubble of a high-rise building next to the embassy was pulled to freedom some 36 hours after the blast. But another man died in the grasp of rescuers just as he was on the verge of being freed.

Search dogs brought to the blast site Saturday by a team of Israeli rescuers indicated that there could be other survivors in the wreckage of Ufundi House, which was felled by the blast that heavily damaged the embassy. Efforts were focused on a woman named Jane who had been conversing with the man who was successfully rescued.

Meanwhile in neighboring Tanzania, where the U.S. Embassy also was rocked by an explosion Friday, employees returned to the damaged compound Saturday to salvage equipment and documents. Prime Minister Frederick Sumaye, who surveyed the scene, vowed that the bombers "will be caught ... and severely punished."

FBI agents were expected to arrive in East Africa by Sunday to begin an intensive investigation into the attacks.

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Most of American dead identified

The death toll in Nairobi stands at 139, including 11 Americans. Nearly 4,300 people were hospitalized with injuries. In the Tanzanian capital of Dar es Salaam, 10 people died, none of them Americans. About 70 others were injured.

The State Department Saturday identified 10 of the 11 American victims. They include six members of the U.S. diplomatic corps: Jean Dalizu, Molly Hardy, Parbhi Kavaler, Arlene Kirk, Michelle O'Connor and Tom Shah; three members of the U.S. military: Marine Sgt. Jesse Aliganga, Army Sgt. Kenneth Hobson II and Air Force Senior Master Sgt. Sherry Lynn Olds; and Jay Bartley, the son of the embassy's consul general, Julian Bartley.

U.S. Ambassador Prudence Bushnell said five Americans are still missing, as are 109 Kenyans who worked at the embassy.

On Saturday, U.S. officials downplayed a claim of responsibility for the bombings received by a London-based Arabic language newspaper, Al-Hayat.

An unidentified caller claiming to be with a group called "The Islamic Army for the Liberation of Holy Places" called the newspaper's Cairo office Friday, claiming responsibility for the blasts. The group was previously unknown.

Similar statements were sent to Qatar's al-Jazirah Satellite Channel and Radio France International. But the State Department says it does not consider the claims to be credible.

Kenya asks for pathologists, plastic surgeons

In the face of the carnage in Nairobi, the Kenyan government made an appeal Saturday for specialized medical help. Its charge d'affaires in Washington, Felistas Khayumbi, said pathologists and plastic surgeons are needed, as well as drugs, blankets, sheets and mattresses.

She said Kenya had already received many offers of assistance.

"Almost everybody has come in to help us. Red Cross is there, many other international communities," she said. "Other countries are all coming in with their support."

Seven U.S. support flights, bearing medical and security personnel and investigators, are scheduled to make the journey to East Africa.

About 60 U.S. investigators were being dispatched to Kenya and Tanzania to try to find out who is responsible for what U.S. officials believe were coordinated terrorist attacks.

The two bombs went off within minutes of each other. Nairobi and Dar es Salaam are about 450 miles (720 km) apart.

Bushnell said the United States as of yet has no idea who might be responsible. But in a radio address Saturday, U.S. President Bill Clinton vowed that "no matter how long it takes or where it takes us, we will pursue terrorists until the cases are solved and justice is done."

CNN Correspondents Jerrold Kessel, Catherine Bond, Ben Wedeman and Louise Schiavone and Reuters contributed to this report.