This presents an interesting conundrum. Anthropologists working in Ethiopia have uncovered stone spear points (they look like cutters to me) that they believe to be 280,000 years old, or 85,000 years older than the earliest recognized human fossils. The age suggests that the stone tools were made by a predecessor to Neanderthals and modern humans called Homo heidelbergensis, or the Heidelberg Man. Or, it could indicated that humans have existed longer than believed.
The tools were found in the Gademotta Formation in the Main Ethiopian Rift Valley.