Just despicable. This report from KOMO News:
Four teens have been arrested after they allegedly threw rocks off an I-5 overpass in Tacoma Saturday. The call for help came in just before 12:30 p.m. for someone tossing rocks off the Delin overpass, according to Trooper Johnna Batiste. A rock hit a car's sunroof while another rock hit a second car's windshield.
Troopers arrested four teens suspected in the incident: three boys aged 14, 15, and 16 plus a 14-year-old girl. One of them was reported as a runaway, Batiste said.
Speaking of throwing - I hope they get the book thrown at them. More photos at KIRO 7.