The Trump administration claims two students from China smuggled a rare fungus into the U.S. that could potentially be used as an “agroterrorism weapon” due to its ability to destroy farm crops. The government has arrested one of the students, while the other is believed to be in China.

Two Chinese researchers have been charged with smuggling a fungus known to be a “potential agroterrorism weapon” into the U.S. with the alleged intent of studying it at the University of Michigan, authorities said Tuesday.