Yanira Perez, second from right, wipes her eyes as she and her mother, Marcela, pay respects at a makeshift memorial to honor the victims of Wednesday's shooting rampage, Saturday, Dec. 5, 2015, in San Bernardino, Calif. The Pakistani woman who joined her U.S.-born husband in killing multiple people in a commando-style assault on his co-workers is at the center of a massive FBI terrorism investigation, yet she remains shrouded in mystery. (AP Photo/Jae C. Hong) , APTOPIX