Prosecutors have filed papers in court alleging that San Bernardino attacker Syed Farook and Enrique Marquez planned to carry out an attack in 2012 that included bombing Riverside City College, then shooting drivers and passengers along a crowded stretch of 91 freeway in a secondary attack.

Marquez is the source for the rifles which Farook and Tashfeen Malik used in the December 2 San Bernardino attack and is under arrest, facing allegations that he only dropped the plans for the 2012 attack after being spooked by “the arrest of a group of men in Chino in an unrelated terrorism case.”

According to the Los Angeles Times, Farook and Marquez “planned to throw pipe bombs into the [Riverside City College] cafeteria area from an ‘elevated position on the second floor.'” Court documents claim “they planned to determine where to throw the bombs ‘for maximum casualties.'” They would then leave and go to a second location by the “91 freeway during rush hour.” They had chosen a part of the freeway “that lacked exits,” thereby decreasing any chances for the motorists to escape.

“Marquez admitted to authorities that he would set up a position in the hills south of the freeway”–for long range shots–“as Farook would throw pipe bombs into the eastbound lanes to stop traffic.” Once enough vehicles were disabled to stop traffic, Farook planned to walk up and down the freeway, shooting drivers. While Farook did this, Marquez planned to take long range shots at first responders, making clear that he would “shoot at police before opening fire on medical personnel.”

Marquez is not charged with taking part in the San Bernardino attacks. He allegedly told authorities that Farook had his rifles “for safe storage.”

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