last i heard the injured were about 200, though that might just refer to people who were hit by a bullet, since many must've been hurt in the ensuing panic.
with 50 dead, this should now be the mass shooting with the highest casualty count in us history, which might still rise.
the one who did it was a white male in his 50s or 60s, his motivation will likely remain unclear as he was shot dead quickly, but looking into his living situation might reveal something.
it might be everything from political affiliation to mental issues or even some manner of ptsd/drugrelated freakout. someone might've even paid him/his family to do it. who knows.
bottomline, once more a tragedy caused most likely by easy access to all types of weaponry :/
chances are slim that weapon laws will change though. my condolences for both the surviving families and the future gun victims