Winfield ? Three south-central Kansas high school students are trying to use what they’ve learned about psychology to figure out why some people can be heartless.

The three are taking a psychology class at Winfield High School. They organized a “Stuff the Bus” event earlier this month, inviting people to fill a bus with new and used clothing for the Winfield Thrift Store.

The Winfield Daily Courier reports that on Nov. 13 they delivered more than half a busload of clothing to the thrift store and left the items on a sidewalk. The worker in charge of sorting the donations went to get some food first and returned to find everything gone.

Police say the thieves must have needed several trips to haul everything away. The case remains unsolved.