CHATTAROY, Wash. – Riverside High School lifted a modified lockdown after a student made threats to the school Friday.

Riverside School District Superintendent Ken Russell said law enforcement arrested the student who threatened to bring a gun to school early Friday and he is in custody.

SCSO announced the student was arrested for an unrelated juvenile warrant just before 4 p.m.

School leaders said all students are safe and classes have returned to normal. After school activities will still take place Friday.

SCSO said the investigation is ongoing.