![](https://cdn.abcotvs.com/dip/images/10969189_082321-wabc-hammer-attack-suspect-img.jpg?w=1600)
NYPD investigators arrested 41-year-old Jamar Newton of Brooklyn.
He has been charged with Assault and Reckless Endangerment.
Surveillance shows the attack, which took place early Saturday night on the northbound N and R train platform at Union Square Station.
Police say the 44-year-old victim was struck in the back of the head after an argument, causing him to fall onto the tracks.
He was hospitalized in stable condition.
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