busy california freeway. according to court papers, marquez not only bought the assault rifles that wound up being used in the san bernardino shooting, but also the powder used to build pipe bombs. marquez appeared in federal court late yesterday to face charges, including conspiring to carry out attacks in 2001 and '12 and unlawfully purchasing those two assault rifles. nbc news correspondent pete williams is joining us. we've learned more about when marquez allegedly became radicalized and just what brewed behind the scenes between these two friends. >> well, it's pretty clear that the fbi believes that syed farooq, there on the left, radicalized his friend, the next door neighbor, first converted marquez to islam and then radicalized him based on anwar al awlaki, the al qaeda figure prominent in so many attacks. and according to the fbi, starting in 2011, they