OAKLAND -- Masked vandals hurled chunks of concrete through windows at a West Oakland coffee shop early Thursday in what the co-owner called "purely political vandalism."

The vandals struck Kilovolt Coffee at about 1 a.m., smashing five windows and damaging the countertop, cabinets and a brewing machine, according to co-owner Ethan Ashley.

Ashley, a West Oakland resident and Berkeley native, said he believes the damage is the work of anarchists upset about gentrification in the area. The shop at 1829 Mandela Parkway was vandalized a few weeks after opening in April, when someone spray-painted "eat (expletive) yuppies," Ashley said.

The latest vandalism came hours after the city planning commission approved a plan to rezone areas of West Oakland to encourage development, a proposal that drew outcries from activists.

"It's a direct response to that," Ashley said Friday. But, he added, "we are here to stay."

Oakland police are investigating the incident, which caused about $1,000 in damage.

David DeBolt covers breaking news. Follow him at Twitter.com/daviddebolt.