US President Barack Obama has laid a wreath for the victims of the 1998 US embassy bombing in the Tanzanian city of Dar es Salaam.
Eleven Americans were killed in the al-Qaeda attack, which coincided with a bombing in the Kenyan capital, Nairobi, which left hundreds dead.
The president was joined for the ceremony by predecessor George W Bush.
President Obama is on the last leg of his second Africa tour as president, which took in Senegal and South Africa.
Mr Obama will also visit a US-owned power plant in Tanzania, following his announcement over the weekend of a multi-billion-dollar electricity initiative.
The $7bn (£4.6bn) five-year initiative is intended to double access to electricity in sub-Saharan Africa, in partnership with African countries and the private sector.
While in the country, Mr Obama is also due to launch a programme helping Africa’s eastern nations of Burundi, Kenya, Rwanda, Tanzania and Uganda trade both with each other and with the US.
BBC
Meanwhile, his wife, Michelle Obama, is expected to take part in African First Ladies Summit organised by the George W Bush Institute and hosted by her predecessor Laura Bush.
