US Senator Barack Obama has visited one of Africa's largest slums in the Kenyan capital on the fourth day of his trip to his late father's homeland.
Obama promised the crowd he would tell Americans their story
"You are all my brothers and sisters," Mr Obama told crowds of excited residents who craned their necks to catch a glimpse of the senator.
Earlier Mr Obama visited Wajir, a rural area in north-eastern Kenya which has been hit by a severe drought.
He is the only black US Senator and is seen as a rising star of the Democrats.
Rubbish and sewage
Mr Obama walked through rubbish and sewage as he toured Kibera, the slum home to at least 600,000 people, many without jobs or legal title to the land they inhabit.
He told thousands of cheering admirers that he would tell Americans about their troubles and lobby for more help.
"Everybody in Kenya needs the same opportunities to go to school, to start businesses, to have enough to eat, to have decent clothes," he said over a loudspeaker.
Mr Obama visited micro-finance institutions - which pool members' resources to provide small business loans - a women's self-help group, and Carolina for Kibera, a project run by the University of North Carolina to raise awareness about HIV and Aids.
On Saturday Mr Obama and his wife Michelle took HIV/Aids tests at Kisumu, which has one of Kenya's highest rates of HIV prevalence, to encourage local people to do the same.
Kibera lacks almost all government services, including water. One in five of the slum's population are HIV positive, disease prevention groups say.
"Obama is our own... It is a sign of great respect that he has come to visit us," said resident Julius Odhiambo, according to the news agency AFP.
Millions of Kenyans have been hit by this year's drought
"He knows the bond of brotherhood in Africa never dies."
Earlier on Sunday, Mr Obama visited the drought-stricken region of Kenya, where a lack of rain during the April-June rainy season has threatened a herding population with starvation and malnutrition.
There he visited a hospital, community centres and aid projects, including a project which helps prevent disease among the herds of cattle, goats and camels.
Mr Obama began his African tour in South Africa but has cancelled plans to visit Rwanda, the Democratic Republic of Congo and Sudan.