Reuters: Tests have confirmed that a green film shimmering on the surface of the Willamette River as it flows through Oregon's largest city is caused by toxic algae that can be dangerous to people and animals, public health officials said on Friday.
Authorities also expanded the "warning zone" issued on Wednesday when the algae was first observed, declaring water recreation unsafe for the hundreds of boaters and swimmers who normally use the river daily at this time of year.
Tests completed on Friday...