Sumgong also won the 2016 London marathon and was due to
defend her title later this month.
"We can confirm that an anti-doping rule violation case
concerning Jemima Sumgong (Kenya) has commenced this week," the IAAF said
in a statement.
"This was part of an enhanced IAAF out-of-competition
testing programme dedicated to elite marathon runners which is supported by the
Abbott World Marathon Majors group."
BBC
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