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The unplanned enounter will see both men lay a wreath at the US embassy there in honor of victims of the 1998 bombing by Al Qaeda that killed 11 people.
Former US President George W. Bush and current President Barack Obama are set to meet in one of the most unlikely places: Dar es Salaam, Tanzania.
The two are also expected to meet with embassy staff.
The arrival of the former and current presidents in Tanzania at the same time was purely coincidental.
Obama is currently wrapping-up his three-country tour of Africa, while Bush is attending a conference on African women organized by his foundation, the George W. Bush institute.
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First lady Michelle Obama will attend the conference and join Laura Bush on a panel discussing women's education, health and empowerment.
The Bush administration pledged $5 billion a year in humanitarian aid to Africa, more than any previous presidency. Bush also founded the President's Emergency Plan for AIDS relief in 2003, which gave $15 million in funding to fight HIV/AIDS.
The Washington Post reported that Obama has continued the program, which was credited with saving two million lives.
Obama administration official Ben Rhodes said that having both men in Africa was a "powerful symbol" of the US's commitment to the continent.