Gun charges will be announced Thursday against Enrique Marquez, who bought the assault rifles used in a deadly Dec. 2 attack here, according to U.S. law enforcement officials. Law enforcement authorities searched Marquez's home on Dec. 5, three days after the deadliest terrorist assault on U.S. soil since Sept. 11, 2001. Two U.S. law enforcement officials told The Washington Post that Marquez had been drinking heavily when he admitted himself into the facility at UCLA. According to officials, Marquez told the FBI that he and Farook had discussed mounting some sort of attack in 2012, but that he got spooked after a terrorism investigation based in Riverside resulted in the arrest of four local men in November of that year for plotting to kill Americans in Afghanistan. Agents have been investigating whether those men or any of their associates - or the FBI's confidential informant in that case - had contact with Farook or Marquez.