In this April 29, 2016, file photo, Mary Cain walks off the track after competing in the women's special 1500-meter run at the Drake Relays athletics meet, in Des Moines, Iowa. Nike will investigate allegations of abuse by runner Mary Cain while she was a member of Alberto Salazar's training group. Cain joined the disbanded Nike Oregon Project run by Salazar in 2013, soon after competing in the 1,500-meter final at track and field's world championships when she was 17. (AP Photo/Charlie Neibergall, File) **FILE**
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