A woman trying to grab a hat dropped by her twin sister fell to her death from an escalator at the World Trade Center’s soaring Oculus transit hub on Saturday.

The 29-year-old New Jersey resident was riding the escalator with her sister at about 5:30 a.m. when her sister lost her grip on the chapeau, law enforcement sources saw.

The woman fell 30 feet to her death, said the sources.

Her sister was taken to an area hospital to be treated for trauma.

Port Authority police are investigating the incident.

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