A teen trying to buy drugs from two other teens at the Long Island Rail Road's Manhasset station was severely slashed in the hands about 3:40 p.m. Friday, Nassau police said.
During the drug buy, police said one of the teens, age 16, assaulted the 17-year-old victim with a knife.
The victim also was robbed of $30. He called 911, police said, adding that he was taken for treatment to a nearby hospital.
The 16-year-old and the other suspect, age 17, will be arraigned on felony assault and robbery charges in Westbury's Family Court on Saturday, police said.