All 50 U.S. states have issued warnings regarding unsolicited packages of seeds sent to residents across the country from China.
State health and agriculture departments all over the United States have shared photos of suspicious seed packages that appear to have been processed by China Post — the official postal delivery service of China.
The U.S. Department of Agriculture announced Tuesday that its Animal and Plant Health Inspection Services is collaborating with the Department of Homeland Security's Customs and Border Protection to investigate the mysterious packages.
"USDA is currently collecting seed packages from recipients and will test their contents and determine if they contain anything that could be of concern to U.S. agriculture or the environment," the department said in a statement.
The USDA advised all U.S. citizens to report the unsolicited packages to their local agriculture departments. It also instructed residents not to dispose or plant the seeds, saying the packages could contain invasive or harmful pests and weeds.
Canada's Food Inspection Agency also issued its own warning following similar reports that Canadians were receiving unsolicited seed packages.