CUCUTA, Colombia (AP) — Venezuela’s National Guard fired tear gas on opposition activists at a barricaded border bridge to Colombia on Saturday, and two protesters were killed near the border in Brazil, as the opposition tried to execute a high-risk plan to deliver humanitarian aid over the obstinate refusal of President Nicolas Maduro.

Opposition leader Juan Guaido pulled himself onto a semitruck and shook hands with its driver as he and Colombian President Ivan Duque gave a ceremonial send-off to an aid convoy looking to transport nearly 200 metric tons of mostly U.S.-supplied emergency food and medical supplies from the Colombian border city of Cucuta.

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