What would you do about neighborhood children?

This school year, there is a group of about 6 kids under age 10 who are picked up by their school bus in front of my house. The bus usually arrives around 6:30 AM. While they wait, the kids stand on the corner screaming. Literally. Not talking, not words, just bellowing and screaming sounds. These kids don't live on either street at this intersection, they live several blocks away on an entirely different street and walk over here to get their bus. There is only one school bus that stops on this corner. This is in the middle of a residential area. I already had a talk with them once when they came in my yard and damaged a young tree, and now their morning screaming ritual is getting to be too much. (They screamed before the tree incident, so it's not merely retaliation for being scolded over that.)

What would you do in my situation? If I found out what school they go to, would the school be cooperative if I ask them to move the bus stop elsewhere? Or would you try to find their parents and reason with them first? (I don't have much hope for that solution, as I've found that kids emulate their parents, and if their parents communicate by screaming, the kids are more likely to be loud themselves.)