A student at Ward Melville High School in East Setauket was removed from the school Wednesday after a social media posting by the student raised concerns, officials said.
The incident was reported to Suffolk County police, which determined there was no threat to the school, a police spokeswoman said.
Sixth Precinct Crime Section officers investigated “a perceived threat” that was reported by a student’s parent who notified police “regarding a post observed in an online chat room,” police said.
The incident came as students across Long Island were ready to walk out of their classrooms Wednesday morning or participate in other symbolic demonstrations as part of a nationwide demonstration.
The walkout came one month after the mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, that left 17 people dead.
Ward Melville school officials did not discuss the content of the social media posting, nor identify the student.
“Please know that the district takes these matters very seriously and will investigate any suspicious act to the fullest extent possible,” Cheryl Pedisich, superintendent of the Three Village Central School District, said in a statement.