In Mexico, a Mexican architect has broken more than two decades of silence to reveal she may have discovered the bodies of three people killed in the 1968 government massacre of student protesters. Human rights groups estimate up to 300 people were killed when government forces opened fire on students gathered in Tlatelolco Plaza. Rosa María Alvarado Martínez says she was working on remodeling the adjacent hospital in 1981 when workers discovered three bodies buried underground. Alvarado says she kept quiet after police told her they would kill her son if she went public. Mexican President Felipe Calderon has drawn criticism for closing the office of the special prosecutor investigating the killings. On Tuesday, the prosecutor, Ignacio Carrillo Prieto, said the bodies should be exhumed and identified.