At least three teens were arrested, and a ghost gun was discovered inside a car at New Milford High School prompting a lockdown, police say.

The incident happened Tuesday at New Milford High School at 9 a.m.  

New Milford Police Chief Spencer Cerruto says a fight broke out between students inside the bathroom at the school, and officials learned there was a 9mm ghost gun inside one of the student's car at the school. 

After the school was placed on lockdown, police arrested one 17-year-old juvenile and two other teens.

The 17-year-old was arrested for possession of a gun and possession of a ghost gun. 

Anthony Jack, 18, and Christian Acosta, 19, both of New Milford were charged with assault and breach of peace. 

The school lockdown was lifted by before 11:30 a.m.