It just came in over the screen crawler at NBC News that Farook Saeed, the Muslim who was earlier identified as a person of interest by people monitoring the San Bernardino Police Department's scanners was identified by witnesses and has been confirmed by NBC news as being one of the attackers. He apparently lived in the house in Redlands at 53 Center Street.
This still doesn't make the killings terrorism although it makes it more likely. It definitely explains why the police have been so reluctant to identify any of the shooters, even though they had obviously identified them.
Watch as they try and spin this.