U.S. Sending Medical Aid

The U.S. Air Force is sending at least two military aircraft with a surgical team and medical evacuation personnel to Kenya and Tanzania, where bombs exploded at U.S. embassies Friday, the Air Force said.

CBS News has learned that two teams of FBI investigators also are scheduled to fly to Africa later Friday.

In addition, the U.S. is expected to bring in more Marines to provide security at both embassies. There is concern that classified documents could be looted from the rubble.

The U.S. Department of Defense said a C-9 Nightingale aircraft designed for medical evacuation would go to Nairobi, and a C-141 military cargo plane, carrying a surgical team, blood and medical supplies and a small security team, would head for Dar-es-Salaam.

Army Col. Nancy Burt, a Pentagon spokeswoman, said that the C-141 would fly from Ramstein, Germany, and that the C-9 was also likely to fly from Ramstein. She had no estimate on when the planes would depart or arrive in Africa.

"The C-9 is a special 'Medivac' [medical evacuation] aircraft," said an Air Force official.

Several American officials were killed and up to 12 were injured when a bomb exploded Friday at the U.S. embassy in Nairobi, according to State Department officials.

The State Department officials, who asked not to be identified, said no U.S. citizens were so far known to have been killed by another bomb that exploded almost simultaneously at the U.S. embassy in Dar-es-Salaam, but three Tanzanians working for the embassy died.