In Nairobi, a solemn ceremony reunited families of the victims and officials at a memorial park in the centre of the Kenyan capital, created on the site of the US embassy.
A total of 224 people were killed in the attacks and around 5,000 injured -- mostly African citizens.
"In the middle of a busy Friday morning, Al-Qaeda terrorists exploded bombs outside the US embassies here in Nairobi and in Dar es Salaam."
"In an awful moment, the lives of thousands changed forever as did the lives of their families and friends," he added.
The Nairobi Chamber Choir gave performed the Kenyan and American national anthems, then participants held candles while the names of the victims were read out to the sound of a solo violin.
"Since then, large parts of the world have endured repeated attacks by terrorists," he added.
A similar memorial service was scheduled to take place in Dar Es Salaam. The twin attacks introduced the world to Al-Qaeda's leader Osama bin Laden three years before the September 11 attacks in New York would make him a household name.
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