Secretary of State Madeleine Albright, leading State Deparment workers in mourning colleagues killed in two embassy explosions in Africa, announced a $2 million reward for information leading to the conviction of "the cowards that committed this act."

She declared that America "will not be intimidated" by bomb throwers.Addressing several hundred State Department workers, Albright said "President Clinton has made it absolutely clear that we will not rest until" the bombers are caught. They will be caught, she said, "for our nation's memory is long and our reach is far."

Clinton, speaking Monday at a health care event in Louisville, Ky., said Americans' "hearts are heavy" because a dozen U.S. diplomats and workers were killed in the attacks on U.S. embassies in Kenya and Tanzania on Friday. He asked for a moment of silence to honor more than 200 Africans who died as well.

"We will do whatever we can to bring the murderers to justice," Clinton declared.

Albright posted the $2 million reward and said she plans to fly to Germany Tuesday night to meet at Landstuhl Hospital, near Wiesbaden, with some of the wounded and members of their families. She will accompany home the bodies of 11 of the 12 Americans who were killed in the explosions.

The White House announced that Clinton also would return early from a three-day trip to Kentucky, Illinois and California in order to discuss the bombings with his national security team.

Albright said the terrorist attack that killed members of the State Department family "tested our faith," but that America's diplomats are prepared to fight for "justice and freedom" around the world.

"These United States, this principled, purposeful nation, will not be intimated," Albright said, her voice rising with emotion. "We will meet our responsibilities and stay engaged in the world . . . (and) keep standing up for the values that the peacemakers cherish and the future that the bomb throwers fear.

"For although terror can turn building to rubble and laughter to tears, it can never - will never - deter America from its purpose and presence around the globe."

Albright's 15-minute speech was interrupted several times by applause.

A dozen Americans, all in Nairobi, were among more than 200 people killed in the bombings, which injured several thousand as bystanders on busy streets were hit by flying debris.

A memorial service was held Sunday in Nairobi at the home of Ambassador Prudence Bushnell.

Albright pleaded for Americans to have patience with what could be a painstaking investigation.

"While there might be an instant gratification to do something about an attack on us, we have to be absolutely sure we have the facts straight," she said Sunday on NBC's "Meet the Press."

"The memory of the United States is very long, and our reach is very far," she added.