LINCOLN, Neb. (AP) — University of Nebraska-Lincoln officials say an assistant professor who went missing in his native China has returned to the United States.

The university announced in a statement Tuesday that Weixing Li was detained for two weeks in China’s Henan Province, about 400 miles southwest of Beijing.

Li told university officials he had borrowed a vehicle from a friend to drive to late father’s hometown, so he could clean his grave. But the friend who loaned him the vehicle had borrowed it from another person Li did not know. Li was stopped at a checkpoint on June 6, and Chinese authorities found pharmaceuticals in the trunk that require a special license.

Li says authorities eventually cleared him of wrongdoing, but then focused on his background. They released him on June 20.