Watch your head if you’re walking near the One World Trade Center tower. Chunks of ice have been falling from the United States’ tallest skyscraper, endangering pedestrians below. Over the weekend, daggers of ice began falling from the building and workers and police moved to close off the sidewalk below to protect passersby from serious head injuries. Areas of the 9/11 memorial site and the World Trade Center PATH train station were also roped off just as commuters came in droves during rush hour.

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According to reports, ice fell from heights of more than 1,000-feet-high from some places on the WTC 1 tower. Taking gravity into account, the dangerous icicles could reach speeds of up to 100 miles per hour. Witnesses also said ice also fell from the 52-story-tall 7 World Trade Center.

The falling ice isn’t the first skyscraper oddity displayed by 1 WTC. Previously, the tower created eerie, high-pitched noises just before Hurricane Sandy struck New York. There are many theories flying around as to why 1 WTC has an ice problem, from the recent string of arctic weather to speculation that the shape of the structure allows ice to simply slide off.

The simple explanation is that the ice forms on the building because it is so tall that water vapor freezes onto its sides. Chris Benedict, an architectural expert, told ABC News that the problem actually stems from the building not being fully sealed. Warm air escapes through leaky parts of the building, causing the ice to melt just enough to fall away from the glass structure. This falling frozen shards issue, however, is not unique to 1 World Trade Center. Recently, ice also fell from the One57 building, New York’s tallest condominium skyscraper.

via ABC News

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