Police arrested a 17-year-old Elmont girl for allegedly assaulting another teen in the Elmont Public Library.

According to police, on Wednesday, March 26 at 3:52 p.m., two teenagers engaged in a verbal argument, which escalated into a physical altercation.

Police allege that one of the teens, a 17-year-old female, stabbed an 18-year-old teen once in the back. The 18-year-old was taken to Winthrop-University Hospital.

The 17-year-old female was arrested at her residence and was charged with second degree assault and fourth degree possession of a dangerous weapon.

Elmont Library Director John Bosco said there was a plain clothes security guard in the library at the time. "It probably would have happened if there was a uniform guard standing at the door. It's not the sort of thing you can completely prevent," he said.

Bosco didn't know what the teens were fighting about. He said it could have been a personal argument.

- Joe Rizza