A 61-year-old woman was killed and four people wounded in a shooting in the Venezuelan capital, Caracas.
The shooting erupted after government supporters on motorcycles swarmed an opposition polling site in a church in the traditionally pro-government Catia neighbourhood of western Caracas today.
Hundreds of thousands of Venezuelans had lined up across the country and in expatriate communities around the world to vote in a symbolic rejection of President Nicolas Maduro's plan to rewrite the constitution.
The proposal has raised tensions in a nation battered by widespread shortages and anti-government protests.
Video posted to social media showed massive crowds outside the church, then hundreds of people running in panic as motorcycle-riding men zoomed past and shots rang out.
Maduro made no mention of the incident in comments on state television shortly after the official close of opposition polls.
He called for an end to violence that he blamed on the opposition.
In what appeared to be smaller numbers in many parts of the capital, government supporters went to polling stations in a rehearsal for a July 30 vote to elect members of the assembly that will retool Venezuela's 1999 constitution.
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