A convicted sex offender was among those arrested by border patrol agents at a Texas border checkpoint amid two human smuggling attempts in commercial vehicles that were intercepted within a day of each other, the U.S Border Patrol announced. The first incident took place in the early evening of Feb. 5, when agents with the Laredo Sector Border Patrol intercepted a tractor-trailer at the Interstate 35 checkpoint, north of Laredo, Texas. While border agents were checking the immigration status of the driver, a dog working with the agents alerted them to the trailer. People who were found in the trailer turned out to be illegal aliens from Mexico, Guatemala, El Salvador, Ecuador, and Honduras. The following evening, border agents found more illegal aliens inside another tractor-trailer at the same border checkpoint after putting the vehicle through a non-intrusive scan. The illegal aliens were found to be from Mexico and Guatemala. In both instances, …