He said the suspect was armed with a semi-automatic rifle equipped with a multi-round clip, and was wearing a military-style vest.
A witness told KCRA his roommate was among the victims and his neighbour was the alleged shooter.
“The crazy thing is that the neighbour has been shooting a lot of bullets lately, hundreds of rounds, large magazines,” the man told the news station. “We made it aware that this guy has been crazy, and he’s been threatening us and everything. I just feel like there maybe should have been more effort put into stopping things like this.”