News Wrap: Investigation underway into Pittsburgh bridge collapse that injured 10

From PBS NewsHour.

In our news wrap Friday, an investigation is underway to determine what caused a Pittsburgh bridge to collapse into a ravine, hours before President Joe Biden visited the city to tout a new infrastructure law. COVID-19 cases have fallen 27 percent in the U.S. over the past two weeks, while the average number of new deaths rose 34 percent. Blizzard warnings are in effect along the U.S. East Coast.

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