A young Iranian woman was shot to death on Saturday while reportedly attending a protest with her father in Iran. While few details are available about who shot her and why, the young woman has been dubbed “Neda,” which means “the call” or “the voice” in Farsi, and has emerged as a rallying symbol for Iranians opposed to President Mahmoud Ahmadinejad.

Footage of the gruesome shooting quickly appeared on YouTube and other internet sites. WARNING: The content of the video is graphic; YouTube requires that you verify your age before viewing it. CNN, meanwhile, links to a video that reportedly shows “Neda” and her father at the protest before the shooting. And over at Twitter, her death (#neda) has became one of the top “trending topics.”

TIME notes that even though it is ”not yet clear who shot ‘Neda’ (a soldier? pro-government militant? an accidental misfiring?), her death may have changed everything.”