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Women’s marathon world record-hold­er Ruth Chep­ngetich was pro­vi­sion­al­ly sus­pend­ed for a pos­i­tive dop­ing test on Thurs­day.

Track and field’s Ath­let­ics In­tegri­ty Unit (AIU) said Chep­ngetich test­ed pos­i­tive for a banned di­uret­ic and mask­ing agent in March and “opt­ed for a vol­un­tary pro­vi­sion­al sus­pen­sion while the AIU’s in­ves­ti­ga­tion was on­go­ing.”

The Kenyan run­ner set the world record by al­most two min­utes at the Chica­go Marathon last Oc­to­ber in 2 hours-9 min­utes-56 sec­onds. It was her third win in Chica­go.