. >> reporter: san bernardino police chief jarrod burguan, teabc news, the shooting began shortly after room, agitated a upset. >> that possibly is a motive in this case. >> reporter: officials now say farook, an american citizen, and his wife, tashfeen malik, who came here from pakistan on a fiance? 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. >> we have an active shooter. >> ma'am, listen to me, take okay, is hstill 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? >>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. who it was. >> reporter: two lone wolves, who died in a fierce gun battle with p