At a press conference in Mexico City, the United States and Mexico pledge to step up efforts to tackle flows of drugs and migrants, setting aside signs of frictions over a US plan to extend a controversial border wall. Fentanyl "continues to devastate families on both sides of the border," says US Secretary of State Antony Blinken after high-level security talks in the Mexican capital. "We have an obligation to do everything in our power to combat this scourge," he adds. IMAGES AND SOUNDBITES