El Paso to Ciudad Juarez - AN12 Flights

Maybe someone knows what’s going on, but I’ve noticed that there is a Meridian Airlines AN-12 (Reg Number UR-CAJ) that has started flying multiple times a day from El Paso to Ciudad Juarez and back. This is a 5-10 minute flight across the border with Mexico. Just curious if anyone knows what (or who) is being transported on these flights. It’s certainly a strange route being flown regularly by a very rare aircraft.