A YouTube video thought to be linked to the shootings in California sees a young man claiming he will get "retribution" for a lack of interest shown in him by women.
The footage shows a young man complaining that it is "unfair" that he is still a virgin before threatening a mass slaughter of college students and Isla Vista residents.
"It's obviously the work of a madman," the sheriff said of the shooting. "There's going to be a lot more information that will come out that will give a clearer picture of just how disturbed this individual was."
More top news
Here's everything we know so far about the latest terrorist incident in France.
A minimum number of black players will have to be selected in all national teams, with the target calculated on an annual basis.
Western areas will see the rain first but by the end of the day it will also have spread eastwards.