Portland, Ore. Portland, Ore.

Thousands of protesters gather in Portland, Ore., Sunday, for competing rallies following last month's fatal stabbing of two men on a light-rail train by a man police say was shouting anti-Muslim slurs. Kristena Hansen/AP hide caption

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Kristena Hansen/AP

A heart-shaped wreath covered with positive messages hangs on a traffic light pole Saturday at a memorial for two bystanders who were stabbed to death Friday on a light-rail train in Portland, Ore. Gillian Flaccus/AP hide caption

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Gillian Flaccus/AP

Marionberry fruit photographed at the National Centre for Organic Gardening, which has been the headquarters of the Henry Doubleday Research Association since the early 1980s. Michael Boys/Corbis/VCG/Getty Images hide caption

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Michael Boys/Corbis/VCG/Getty Images

There are signs around the reservoirs in Portland's Mount Tabor Park that warn against putting anything in the water. They apparently didn't dissuade one young man from urinating into the city's drinking supply this week. Randy L. Rasmussen /The Oregonian/Landov hide caption

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Randy L. Rasmussen /The Oregonian/Landov