Besides the eight pupils, who got injured in the crash, a manager of Trinity Academy also sustained injuries.
The driver of one of the two school buses was overtaking another vehicle during the head-on collision at Tokyo stage, an eyewitness, Grace Kanini, told The Standard.
The injured victims were taken to different hospitals in Kirinyaga West Sub-County.
"A female teacher, who had been trapped in the Trinity Academy bus, died on the spot," police said.
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The body of the teacher was taken to Kerugoya County Referral Hospital morgue.
The wreckages of the two buses were towed to Sagana Police Station as investigations begin.