The Chilean military coup against President Salvador Allende occurred on September 11, 1973. The military surrounded the town of Santiago and searched for people hiding in potential guerilla insurgent locations. Civilians were detained for long periods of time and some disappeared. Following the coup, bodies were abundant in the streets and in the Mapocho River. It is estimated that 3,200 people were executed or disappeared between 1973 and 1990 in Chile. Higher estimates are up to 4,500 people. These bodies were taken to morgues to be identified and claimed. Unidentified bodies were buried in marked mass graves.