The US Department of Agriculture have closed 6 offices in 5 states due the threats received, reports the CNN, referring to the USDA spokesman Matthew Herrick. According to the spokesman, the USDA received threats against the staff of the department. Other details were not disclosed. Herrick said that the USDA cooperates with local and federal law enforcement agencies, as well as with the FBI, to understand the extent of seriousness of the  threats.