( CNN ) -- A tractor-trailer clipped one bus carrying students back from a college visit and then struck another head-on , leaving three dead , Mississippi authorities said Tuesday . A teacher , school bus driver and the driver of the big rig died in the Tuesday afternoon incident near Calhoun City , authorities said . `` I 've been doing this for 41 years and this is the worst wreck with this number of people I 've seen , '' said Calhoun County Sheriff Billy Gore . `` It 's troubling to see so many young kids so so frightened . '' The school group was returning from a visit to the University of Mississippi , officials said . Mitchell Diggs , a spokesman for the University of Mississippi , said the group from Ackerman High School in Choctaw County was in Oxford for a typical admissions visit for seniors . The students later took a tour and had lunch before departing the campus around 1 p.m. , Diggs said . About 60 children were on the buses , and 10 were transported to area hospitals after the 2:30 p.m. collision , officials said . One patient was airlifted , Gore said . The rest suffered mostly bumps and bruises , he said . The accident happened on state routes 8 and 9 , which are combined for several miles . Footage provided by CNN affiliate WMC in Memphis , Tennessee , showed the damaged bus on a narrow bridge . The truck continued a few hundred yards before coming to a stop . Calhoun City is in north central Mississippi . The investigation is continuing . CNN 's Craig Bell and Sara Pratley contributed to this report .
NEW : Teacher , bus driver , truck driver are killed in Mississippi wreck , officials say . A school group was returning from a college visit . About 60 students were on the two buses .