From khou.com:
EL PASO, Texas — El Paso police are investigating two mysterious billboards that appeared just off I-10, each with a mannequin hanging from a noose. .
“It’s not an advertisement,” said Mike Mons, regional manager for Lamar Outdoor advertising.
The first vandalized billboard off I-10 had Plata o Plomo in large black letters which translates into silver or lead. It is usually a warning targeting police or government officials in Mexico. The warning: work with a cartel and take a bribe or get a bullet.
The hanging mannequin was dressed in a suit and tie.