Smithtown East school officials said an individual who wrote threatening statements in student bathrooms before Friday night’s junior prom had been identified.

Suffolk police “arrested a 15-year-old female. She is a student at Smithtown East High School,” Assistant Police Commissioner Justin Meyers said in a statement Friday night. “She was charged with making graffiti. The [girl’s] house was searched and there were no weapons found. Police will have a presence at the prom for the entire prom.”

The charge is a misdemeanor and the girl was released to her parents Friday, a police spokesman said.

Although they did not name the individual, school officials said security measures put in place during the school day Friday would continue “as a precautionary measure” for the evening prom.

Those measures include a police presence on campus, additional security guards and a search of all backpacks and bags before students enter the prom.

In a call to parents, Principal Kevin Simmons said: “While I can’t divulge specifics as all individuals have the right to due process, the individual is no longer on school grounds and this issue is in the capable hands of the Suffolk County Police Department. Please note that at no time were any of our students in danger as our safety and security remained high.”

School officials had stepped up security — with police on campus and added guards — for classes Friday after the threatening written statements were found in the school earlier in the week.

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In a call to parents Thursday, Simmons had said he was “made aware of threatening statements written in student bathrooms” referencing the junior prom. “Suffolk County police were notified immediately and a thorough investigation has been initiated and is currently ongoing,” he said.

District officials had no further comment.