At least two people were hurt when rocks or large pieces of concrete were thrown at cars on Interstate 90 in Western Washington. According to the Mercer Island Fire Department, firefighters responded to two different calls Tuesday night of rocks hitting cars on I-90 near the Mount Baker Tunnel in Seattle. Witnesses told Washington State Patrol a man with a black backpack was seen throwing the rocks. One of the drivers hit made it to Mercer Island where they could safely pull over and call 911. Firefighters said people inside the cars were injured in both cases. One person was taken to the hospital. Trooper Rick Johnson said not only is the malicious mischief dangerous, it is a felony since people were hurt.