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A protective coating covering the glass produced the spider web of cracks.
A protective coating covering the glass produced the spider web of cracks.Alejandro Galibay/AP

CHICAGO (AP) — Popular observation ledges at Chicago’s Willis Tower have reopened after the towering glass bays were closed for inspection when they appeared to crack beneath visitors’ feet.

The Willis Tower temporarily limited access to the bays, known as The Ledge, on Thursday for routine inspection. The rest of the Skydeck on the 103rd floor of the building formerly known as the Sears Tower remained opened.

The glass itself didn’t crack Wednesday night and officials say visitors were never in danger. Instead, a protective coating covering the glass produced the spider web of cracks.

A spokesman says Friday that all four bays are open.

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The ledges first opened in 2009 and attract visitors in part because walking onto them allows the disconcerting feeling of stepping onto air, hundreds of feet above ground.

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Cracks appear on glass ledge at Chicago skyscraper