US Secretary of State Rex Tillerson canceled on Saturday a day of events in Kenya due to illness. "The secretary is not feeling well after a long couple days working on major issues back home such as North Korea and has canceled his events for the day," said a brief statement from Undersecretary of State Steve Goldstein. The US diplomat, who arrived in Nairobi on Friday, had been due to visit the AIDS-relief program 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. The PEPFAR event went on without him, while the embassy visit was scrapped. There are no indications his illness is serious. A rigorous Africa schedule that included stops in three countries on Friday has been made even more strenuous for Tillerson by events in Washington. Tillerson was up much of the previous night working the phones when President Donald Trump agreed to a meeting with North Korean leader Kim Jong Un. Trump stunned the world by accepting an invitation to meet Kim 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. Tillerson had started his day Friday in Ethiopia with the North Korea announcement and flew to Djibouti for a brief visit before continuing on to Nairobi. Kenya is the third stop of a five- country tour of Africa. Tillerson is due to travel to Chad on Monday then on to Nigeria a day later.