. >> reporter: officials now say farook, an american citizen, and his wife, tashfeen malik, who came here from pakistan on a fianc? visa, were sharply focused on the holiday gathering. this surveillance video obtained by abc news, shows farook at a california firing range just two days before the attack, practicing with the weapons he and his wife would use. >> 911. >> we have an active shooter. >> ma'am, listen to me, take a deep breath. okay, is he still shooting? >> oh, my god. >> reporter: farook and his wife killed 14 of his fellow workers at the party, and wounded 22 more. >> how many rounds did he fire? >> oh my god, a million. >> reporter: a short time later they posted a message on facebook pledging allegiance to isis leader abu bakr al baghdadi. but officials say the couple actually had to conduct an online search that very morning, who is the leader of isis? >> maybe they didn't truly know who it was. who died in a fierce gun battle with police, after killing so many. >> just incredible that that was a year ago tomorrow. brian here with us tonight. you're learning that the