The driver of the pickup truck, 25-year-old Richard Anthony Sepolio, drove his truck off the San Diego-Coronado Bridge. Underneath the bridge, crowds of motorcycle enthusiasts at Chicano Park gathered to begin the La Raza Run.
The pickup truck crushed a booth on the ground, pinning several people underneath. Four people died at the scene, according to the Los Angeles Times. Nine other people received injuries.
Two of the injured, including the driver, sustained major trauma. Police arrested the driver, a Navy man stationed at nearby Coronado, for driving under the influence, reports the Los Angeles Times.
The driver was heading northbound on Interstate 5 to go west on the bridge at around 3:45 p.m. local time when the incident occurred. Hundreds of people were in the crowd at Chicano park.
The following information is provided by the National Highway Traffic Safety Administration (NHTSA).