On Wyandotte St. after 7 pm. a van of teen boys travelling east just at Pillette opened up the passenger sliding door and threw a can of pop at a cyclists tires. A couple of blocks later the door opens again and a hand reaches out toward another cyclist and he yells something out. At this point I followed the van and they sped up through the streets of Riverside, not stopping at signs but barely slowing down flying through the stop signs. Finally they turned onto a deadend street, I pulled into the house across the road and they backed up and took off. Spoke to the people sitting out there and they thought the van was going to go driving right through the fence. Obviously this van was a parents van and the kids were out joy riding and driving dangerously. If these were my kids I would want to know they were being irresponsible and causing safety concerns for the public. The van was a green grand caravan with a pink magnet on the back that said princess on board drive safely.