Somali terror group al Shabaab told regional news channel Al Jazeera it had carried out the attack.
Richard Engel, NBC News chief foreign correspondent, and Michael McFaul, former U.S. ambassador to Russia, discuss the allegations.
Officials identified the killer as a former employee at the facility for disabled people where the attack took place.
General Mills widened its recall of potentially contaminated flour, and health officials said 46 people have been made sick so far by raw flour.
The so-called Sand fire keeps growing — it's at more than 33,000 acres so far — fueled by dry brush, soaring temperatures and winds.