MEXICO CITY (AP) — The temporary closure of airspace over El Paso, Texas , on Wednesday caused unease south of the U.S.-Mexico border and put the spotlight on the use of drones by Mexican cartels. The criminal groups have used the technology to modernize their operations, smuggle fentanyl, organize migrant border crossings, surveil territory and wage war on rival cartels and Mexican authorities. U.S. officials initially said the airspace was closed to halt an incursion by Mexican cartel drones,