Rarer incident of a mass attack in the U.S. that was carried out via knife, rather than gun (or explosives). The apartment complex that was targeted housed many refugee families, but police say that right now they don't know the suspect's motives. He's in custody, btw. It could be an animus against refugees but this might also be something personally-motivated. OR mental-health-related, possibly. Just don't know yet.
If it's someone with a grudge against immigrants, then the media is culpable.
This is the problem with 'free speech' when it incites violence.