An unhinged assailant randomly whacked a straphanger with a piece of metal in a Lower Manhattan subway station this week, authorities said.
The 52-year-old victim was on the stairwell at the Brooklyn Bridge-City Hall station around 6:20 a.m. Wednesday when the stranger approached him and struck him in the head with the metal slab, cops said.

The victim, who suffered a cut on his head, was taken to Bellevue Hospital, where he was listed in stable condition.
The suspect fled the station on foot, and the NYPD released a photo of him late Thursday.
No arrests have been made.
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