Construction is underway in San Diego of eight prototypes for a proposed border wall between the United States and Mexico.
Construction of the prototypes began in late September, with four of the structures made of concrete and the other four made of alternative materials. All prototypes will measure between 18 and 30 feet in height, with the goal of stopping illegal border crossings from Mexico into the U.S.
The designs must meet requirements set by the U.S. Border Patrol. Ronald Vitiellio, acting deputy commissioner of U.S. Customs and Border Protection, said the wall will include barriers, technology and personnel.
The prototypes are scheduled to be completed by the end of October. Below, take a look at how construction looks from Tijuana.