Engineer's View of the Pittsburgh Bridge Collapse

A Pittsburgh Port Authority bus and several vehicles lie in the collapsed structure. (Credit: Gene J. Puskar / AP Photo)

A Pittsburgh Port Authority bus and several vehicles lie in the collapsed structure. (Credit: Gene J. Puskar / AP Photo)

Damaged vehicles seen from above at the base of the collapse (Credit: Reuters)

Tragedy struck Pittsburgh early Friday morning on Forbes Avenue when the Fern Hollow Bridge on the eastern edge of the city came crashing down onto Frick Park. Ten pe…
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