 Although the exact details of the assassination remain disputed , the involvement of the Portuguese government , particularly <unk> Press or PIDE , is generally accepted by most historians and biographers and is supported by the Portuguese stay behind <unk> @-@ esque army , known as <unk> Press , that suggested in 1990 that they were responsible for the assassination . Initially , due to the uncertainty regarding who was responsible , Mondlane 's death created great suspicion within the ranks of the FRELIMO itself and a short power struggle which resulted in a dramatic swing to the political left . 
