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Visitors stand on the glass balcony at the skydeck of the Willis Tower in Chicago, Illinois, U.S., on Wednesday, Feb. 13, 2013.
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Visitors to the 103-floor glass Skydeck attraction at Chicago’s Willis Tower—formerly known as the Sears Tower—were in for a scare when cracks appeared in the glass.

Alejandro Garibay told NBC Chicago that he was on the glass with his brother and two cousins Wednesday night when they heard cracking. He said even the staff, whom he alerted, were shocked to see the cracks form.

A spokesperson for the tower says the cracks only appeared on a protective coating and the glass structure, designed to hold five tons, was not damaged. The attraction, which opened in 2009, is still open, but one of the four “Ledge” platforms was roped off Thursday morning and a carpet covered the floor, according to the Chicago Sun-Times.

Still, scary stuff.

[NBC Chicago]

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