training last year in the same room as the attack. the "l.a. times" reports that it's unclear if gunman syed farook attended that training. authorities have fielded numerous tips since last week's mass shooting. investigators are looking into an account from the management of the los angeles office tower, this one, they say someone looking like farook unsuccessfully tried to get inside in the past few weeks. the building overlooks hotels, and banks. nbc's stephanie gosk is following the latest on the san bernardino attack, and has more now on the investigation. >> reporter: a photo taken at chicago's o'hare airport shows tashfeen malik arriving in the u.s. for the first time in 2014. syed farook at her side. >> both subjects were radicalized and had been for quite some time. >> reporter: the fbi confirms that the couple practiced their shooting skills at l.a. area firing ranges, just days before killing 14 and wounding 21. nbc news has learned that farook was at the magnum range in