A van full of international students attending a university in Ohio overturned on a snow-covered highway early Wednesday, killing two, authorities said. The rental van rolled several times and landed on its roof in the median of the Indiana Toll Road in northeastern Indiana, state police Cpl. Derek Fisher said. The two students killed _ Apsana Giri, 26, a graduate student in biology from Katmandu, Nepal, and Sweety Mazumdar, 25, a graduate student in geology from Calcutta, India _ were thrown from the van, state police said. Two other students in the van, both men, suffered minor head injuries. All were students at Bowling Green State University. There was a discrepancy about how many people were in the van. State police said six people were in the van, while Bowling Green spokeswoman Teri Sharp said it had seven passengers.