An investigation uncovered a network of U.S.-based "laptop farms" that helped North Koreans secretly infiltrate American businesses, the U.S. Attorney's Office for the Northern District of Texas said Tuesday.

The scheme aimed to fund the regime's nuclear weapons and ballistic missile programs.

What we know: During "Operation Lone Star Roundup," federal agents seized more than 185 laptops and devices from around 40 locations across Texas, U.S. Attorney Ryan Raybould said.