Charles City police have arrested two boys as part of a case of so-called "MacGyver-style" bottle bombs being left on an elementary playground. Police say they took the two boys, ages 14 and 15, into custody on Thursday and charged them with having an explosive device, an aggravated misdemeanor.

Last week police on two different occasions investigated about 10 bottle bombs being left on the playground at Washington Elementary School, with at least four bombs exploding, spraying chemicals in the area surrounding the bomb. The two teens have been taken to the North Iowa Detention Center in Waterloo.