July 17, 2012 -- Updated 0338 GMT (1138 HKT) Robbers accost two Peace Corps volunteers, a source says Following drops of blood from the body, police were led to Kristler, the officer said. By way of explanation for why he hadn't reported to the incident to police promptly, the volunteer allegedly told authorities he had been advised by the U.S. Embassy in Accra to stay indoors, the officer said. That account was disputed by Mike Koffman, the country director of Peace Corps in Ghana. He said Kristler reported the incident. U.S. State Department spokesman Patrick Ventrell weighed in on what happened Monday. Nearly 5,000 Peace Corps volunteers have served in Ghana since 1961, according to the program's website.