Two-time London Marathon winner and former world record holder, Wilson Kiprotich Kipsang, received a provisional suspension Friday by the Athletics Integrity Unit (AIU).

The AIU said the suspension is due to “for whereabouts failures and tampering, both violations of the World Athletics Anti-Doping Rules.”

The 37-year-old high-profile Kenyan runner has won many races in across the world. In the 2013 Berlin Marathon he claimed the world record after crossing the finish line in 2.03.23.

The rate at which Anti-Doping Rule Violations are coming out of Kenya has pushed the country to enact policies that will impose criminal charges

Read more: London Marathon winner Wilson Kipsang suspended by AIU