May 30, 2014; Eugene, OR, USA; Galen Rupp (USA) embraces coach Alberto Salazar after winning the 10,000m in an American record 26:44.39 in the 40th Prefontaine Classic at Hayward Field. Mandatory Credit: Kirby Lee-USA TODAY Sports
(Reuters) - American coach Alberto Salazar is being investigated by the U.S. Anti-Doping Agency (USADA) to determine if anti-doping rules may have been violated, a source told Reuters.
The agency is seeking documents and interviewing witnesses, the person, who is familiar with the investigation, said.
