and he said after that hearing that it appears at this time that this suspect acted alone. there's been a lot of confusion through the day about a possible second suspect. the authorities seem to be backing off on that, but right now, we have this information coming out tonight, from a probable cause affidavit, that this shooter is saying that he spared people he liked and targeted people he didn't. don? >> drew, it's interesting, only 17 years old, and it's sad that you have to look into the background of a 17-year-old kid , really. you have been looking into the background of a shooter. what have you found? >> we have been doing the usual digging and grubbing of social media and friends and everything looking for any kind of signs. and we're stymied by this, quite frankly, don. earlier today, greg abbott, the texas governor said there were no warning signs, as far as they can tell. we still don't see any tonight, but we do have limited, limited exposure to this person on his social media.