Tract B was the STRATCOM receiver site and was the site closest to the Asmara airport. Following the withdrawal from Tract B by U.S. Military forces the Tract B site was used as a prison. On May 19, 2004, Amnesty International reported, under the heading of "Secret Prisons in Eritrea" the existence of a secret prison on Tract B (also known as "Track B," which they stated was located near the airport in Asmara. The prison was said to hold Eritrean People's Liberation Front veterans, conscripts, alleged armed Islamists, and people accused or forging identity documents or smuggling army deserters out of the country.