Police say the juvenile, who is not being identified due to their age, was taken into custody and charged Wednesday following a third lockdown at the school.
Police are expected to hold a news conference on the arrest this morning.
Police released a statement about the incident writing in part, "After an exhaustive investigation conducted by the Norwalk Police Detective Bureau
in conjunction with the Norwalk Public Schools, a juvenile has been taken into custody regarding three hoax threatening incidents at Norwalk High School."
The first incident, a bomb threat, occurred on Dec. 1, followed by reports of an armed person within the school that occurred on Dec. 3, and Dec. 8.
The juvenile was charged with threatening, three counts of falsely reporting an incident, three counts of breach of peace, and three counts of conspiracy.
The juvenile has been referred to Juvenile Court.