Doug Bloch, a representative for the Teamsters unit, said that only the outer layer of the buses' double-paned windows cracked, suggesting that the projectiles lacked the force of bullets.
A source tells us that due to the nature of how the windows were impacted, some suspect the weapon being used could be a BB or pellet gun.
The tech giants operate free shuttle services between San Francisco and their offices in Silicon Valley, at least an hour's drive south. The buses were attacked on highway 280, so the company has made a decision to divert them from that road, even though doing so would extend the commute time by 30-45 minutes in either direction. The memo went on to note that bus routes will be temporarily diverted away from I-280, the highway on which the incidents occurred. This change in routes could mean an additional 30-45 minutes of commute time in each direction for some riders. Thank you for your patience and understanding. Apple later told Mashable that it is working with police to investigate the incidents.
"We're not certain what caused the damage at this time, but we're not ruling anything out", CHP Officer Art Montiel said.
Apple is rerouting its shuttles to Highway 101 as a safety precaution, he said.
Why are the buses being attacked?
"[We're] taking the precaution of re-routing shuttles as we hear of any incidents", Google wrote an in an internal email, according to Mashable.
At least one Google bus has also been vandalized.
Demonstrators in 2013 and 2014 blocked and damaged buses to protest the booming tech industry's impact on affordable housing and the gentrification of San Francisco.
Robots are the next step in using technology to explore sexuality.
The buses typically do not bear names of companies, but acronyms for destinations that appear on the vehicle's digital banners can indicate to which tech campus they travel.