Anti-tech shuttle protesters blocked and climbed on top of a Yahoo bus near MacArthur BART station Wednesday morning — and one photo claims protesters on the bus roof vomited on the windshield. The image is below.

BART and Oakland police responded to calls of 15 to 20 protesters blocking and climbing on top of a bus outside the station around 7:30 a.m., said BART police Lt. Paul Kwon.

Tweets and photos from the scene show protesters blocking the buses with signs of “Love the Bay, Block the Bus” and “Capital is the Driver, Gentrification is the Vehicle, Techies on the Bus.”

Yahoo bus blockaded at MacArthur station #googlebus #techbus all of your base are belong to us! pic.twitter.com/YWcTv6pMRV — The Red Son (@revscript) April 2, 2014

Another tweet showed the windshield, which appears to have vomit on it.

Photos also show an Apple bus in the mix. Protesters drove up in a car stylized as a “hearse” with a sign that said “GBus to MTV,” which is usually shown on Google buses.

The protesters eventually disbanded peacefully, Kwon said.

Dancing protesters in clown costumes also blocked a Google bus in San Francisco’s Mission District Tuesday morning in advance of Tuesday evening’s Board of Supervisors vote on an environmental appeal meant to stall the city’s 18-month shuttle pilot program, which would allow tech buses to use a limited number of Muni stops for a $1 per stop event per day fee.

After six hours of hearings, supervisors voted 8-2 to deny the appeal and move forward with planning for the pilot program, which would happen in San Francisco and is set to begin in July.