New Mexico's attorney general on Friday opened a criminal investigation to determine whether U.S. Drug Enforcement Administration agents broke state law by allowing hundreds of thousands of fentanyl pills to reach the streets of Albuquerque.

Mexico and the United States reopened Saturday a sterile fly production facility in the southern Mexican state of Chiapas, expanding efforts to contain the New World screwworm, a livestock pest that has disrupted cross-border cattle trade.