SAN ANTONIO, April 28 (UPI) -- Madison High School was placed on lockdown Monday morning when a teen reported missing by parents was found on campus with loaded guns.

A 17-year-old boy’s parents woke up and realized their son was not home and searched the house only to discover three weapons missing along with the boy.

They immediately notified school officials who confirmed their son was on campus.

The parents rushed to the school and their son was brought to the office. When his backpack was searched, he was found to be carrying two loaded handguns and a knife.

When asked if he had any other weapons, the boy admitted hiding an AK-47 in restroom trash can.

According to North East Independent School District officials, the boy admitted his plan to make a list of demands over the school’s intercom system and his intention to enact violence if his demands were not met.

The boy, whose identity has not been released, is in custody and facing a long list of charges.

NEISD believes the student was acting alone.

The school was locked down while police searched for any other firearms. After canine units cleared the campus, the lockdown was lifted at 11:30 a.m.

No one was hurt.