Kenya's Joyciline Jepkosgei won the women's London Marathon as Ethiopia's Sisay Lemma triumphed in the men's race in the first full-scale staging of the event since the coronavirus pandemic.
Athletics Integrity Unit said in a statement that a charge was issued against Wanjiru for "use of a prohibited substance/method", but the Kenyan said he was clean and had never used doping.
Kenyan runners Mary Keitany and Daniel Wanjiru win at one of the world's biggest athletics events.
Kenyan athlete Jemima Sumgong wins Women's Elite Race in London Marathon despite her fall near end of race
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