School buses could be a target. We need to surround our schools and our children with prayer. God has spoken this to several intercessors during one conference in 1999. Pray for angelic protection.
I think this goes beyond school buses. What ever they are planning will be on a national level, like the WTC attacks. I doubt it will be local acts of random violence.
Movie theaters, football games, school busses (or schools), traffic jams during rush hour, the beach at Ocean City, Md on a hot July day, state fairs, etc.
Jeez - There is no shortage of potential targets where massive numbers of people could be killed by a single, well armed terrorist.
Keep you eyes open and question something that looks out of place or unusual. And don't hesitate to call authorities or confront the suspect yourself, even innocently like to ask directions, just to satisfy your curiosity.
And let's see the damn interepts if the exist.