CNET
Protesters block an Apple bus as a Google bus passes in San Francisco in 2013. Steven Rhodes/Getty Images. Five buses used to shuttle Apple employees around the San Francisco Bay Area have had windows smashed in suspected pellet gun attacks during the
Apple diverting worker shuttles because of smashed windowsAppleInsider (press release) (blog)
5 shuttle buses chartered by Google, Apple apparently vandalized on I-280, possibly with pellet gunSFGate
Buses for Apple employees attacked with pellet guns, company suspectsThe Guardian
SF Weekly -The Mercury News -San Francisco Examiner -KTVU San Francisco

Source: TECH