American marathon star Emily Sisson has joined athletics fans in blasting marathon world record holder Ruth Chepng'etich, who tested positive for banned substances.

Kenya's Ruth Chepng'etich, who is the Women's Marathon World Record Holder, has been provisionally suspended by the Athletics Integrity Unit (AIU) for doping.

Ruth Chepngetich, the women's marathon world record holder, is provisionally suspended by the Athletics Integrity Unit (AIU) for a banned substance.