A third Chinese national is accused of smuggling biological materials into the U.S. for work at a University of Michigan laboratory. Chengxuan Han, of the People's Republic of China, is charged with smuggling goods into the U.

Chengxuan Han accused by federal government of sending four packages to the U.S. from China containing concealed material related to roundworms.

A criminal complaint filed in U.S. District Court Monday alleges Chengxuan Han sent four packages in the last several months containing biological material relatd to round worms.