Cops have arrested a 32-year-old ex-con they say slashed another man in the face during an unprovoked attack outside a Lower East Side subway station , officials said Tuesday.

Demitri Marshall was taken into custody around 5:30 p.m. Monday, less than 12 hours after he attacked a 27-year-old man outside the East Broadway station near Canal and Essex Sts., officials said.

The victim had just exited the station around 7:40 a.m. Monday when Marshall ran up to him and slashed him in the face, officials said.

EMS transported the victim to New York-Presbyterian Hospital Lower Manhattan Hospital , where he was in stable condition.

After a search of the area after the attack, cops grabbed Marshall and charged him with assault.

His arraignment in Manhattan Criminal Court was pending on Tu

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