The two 16-year-olds involved in an incident in Castle Rock that prompted 30 homes to be evacuated and a house to be condemned were charged Thursday afternoon.

One of the teens is charged with possession of an explosive or incendiary device and possession of a handgun by a juvenile. He is being held on a $1 million bond, according to the District Attorney’s Office.

The second faces two counts of sexual exploitation of a child and possession of a handgun by a juvenile. His bond has been set at $50,000.

Because they are under 18, neither teen has been identified. The explosives are not believed to be connected to recent threats against Douglas County schools.

The incident began early Monday morning, when the teens were arrested for “suspicious behavior” in downtown Castle Rock.

When officers went to one of the teens’ homes in the 400 block of West Prestwick Way to notify his parents, they found chemicals and decided to call in the bomb squad.

“As the initial bomb squad technicians went through the house, they found a number of items, a number of other chemicals, things that looked suspicious,” said Sgt. Tim Ratcliff with the Castle Rock Police Department.

Those explosive devices were later detonated at the nearby Plum Creek golf course.

In the meantime, 30 neighbors were evacuated. The home was condemned, and hazardous materials containers were seen in the driveway.

The evacuees were allowed to return early Tuesday morning.

Both teens are expected to appear in court again in the coming weeks.