"The secretary is not feeling well after a long couple days working on major issues back home such as North Korea and has cancelled his events for the day," said a brief statement from Undersecretary of State Steve Goldstein.
![Turkey, others back Iran's warning to Israel, US disputes claim [Le Monde]](data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20width%3D'100'%20height%3D'100'%20data-ring-placeholder%3D'1'%3E%3C%2Fsvg%3E "Turkey, others back Iran's warning to Israel, US disputes claim [Le Monde]")
The announcement comes little more than 24 hours after US President Donald Trump stunned the world by accepting an invitation to meet North Korea's Kim Jong Un before the end of May.
The audacious diplomatic gambit, which was taken before consulting key confidantes including Tillerson -- who was in the Ethiopian capital Addis Ababa at the time -- left aides scrambling to catch up.
Just hours before the summit announcement, which emerged late on Thursday, Tillerson had said Washington was "a long way" from talking directly to North Korea as he kicked off his five-nation Africa tour.
The US diplomat, who arrived in Nairobi on Friday, had been due to visit the AIDS-relief programme PEPFAR on Saturday and also attend a ceremony marking 20 years since Al-Qaeda bombed the US embassies in Kenya and Tanzania, killing 224 people.
Plans to lay a wreath at the site could be rescheduled, Goldstein said.
Tillerson is due to travel to Chad on Monday then on to Nigeria a day later.
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