His motives remain unknown.
Five people were injured, one woman died when unknown persons opened fire at the bus, which was traveling from Los Angeles to San Francisco, USA, reports the Chronicle.info with reference to the Correspondent.
Reports of the shooting came around 1:30 local time. According to TV channel KTVU, the victims received injuries of moderate and severe degrees of severity. Some of them were taken by helicopter to medical facilities.
In the bus there were about 40 people. The shooter was arrested. His motives are currently unknown.