WASECA — Two teenagers charged in a foiled explosives plot at a southern Minnesota school have pleaded guilty.

Both teens pleaded guilty last week to felony possession of explosive material. They were accused of helping a classmate detonate small “test bombs” around Waseca, resulting in property damage.

Their classmate, John LaDue, is accused of plotting to kill his family and attack his school with firearms and homemade explosives. Police and prosecutors don’t believe the two teens were aware of his plot.

Waseca County Attorney Brenda Miller said she was pleased with the plea agreement.

The teens are on probation and must perform community service and write letters of apology.

All three were 17 when they were charged. The Associated Press generally doesn’t identify juveniles accused of crimes.