Last Updated 12:31 p.m. ET
ELMONT, N.Y. Children at Elmont Memorial High School remain in lockdown mode after a report of a suspicious person, possibly with a weapon, in the area, CBS Station WCBS reports.
The lockdown was put into effect shortly after 8 a.m., in response to a 911 call from a woman who said she saw a male teenager with a backpack and a lime green gun.
No injuries have been reported.
Nassau County Police were still guarding the entrance of school more than three hours later. SWAT teams were also seen in front of the school building.
Radio Station WINS reports students were kept in classrooms with locked doors and the lights turned out. Some students were turned away because they were arriving at school as the lockdown was beginning, but worried parents have began congregating around the school because their kids are still inside.
A search of the school and the area is ongoing.
WINS correspondent Glenn Schuck reports police helicopters also searched the surrounding area by air.
Parents received "robo-calls" notifying them of the situation.
One parent who showed up at the school told Schuck she has been in touch with her child, who told her the students are huddled in corners of their rooms with the lights out.
Long Island high school on lockdown
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Long Island high school on lockdown