All the major news outlets are using phrasing like "clash" and "the protests have turned violent" without making claims about who's shooting whom.
However, with stories like this: http://www.bbc.co.uk/news/world-latin-america-26283971 "Venezuela threatens to expel CNN over protest coverage" and the fact that the government is shutting down internet access pretty clearly indicate to me that the story is being suppressed and that the government is trying to violently quash a rebellion.