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Two-time cross-country world champion Emily Chebet was among seven Kenyan athletes banned for doping Friday, another indication that the country has a serious problem of cheating among its famed distance runners.

Chebet, the cross-country world champion in 2010 and 2013, was banned for four years after testing positive for the diuretic and masking agent furosemide, the Kenyan athletics federation said.

The list of sanctions announced by Athletics Kenya included bans for the two runners that failed doping tests at the world championships in Beijing in August. Joyce Zakary and Koki Manunga, who were provisionally suspended at the worlds, also received four-year bans for furosemide.