Three bullets pierced through a local ABC news station in California's capital ... and people were inside working when the shooter opened fire.

Cops in Sacramento say someone shot up the ABC10 news station downtown Friday afternoon ... with police responding to reports of shots being fired just after 1:30 PM ... and footage shows three bullet holes in one of the building's windows. Fox 40

Journalists were working inside the building when the bullets came bursting through ... but incredibly, no one was injured.

Police say this was a drive-by shooting ... an investigation is ongoing, with no arrests made. Fox 40

ABC10 is an ABC affiliate ... and the station broadcasts in Sacramento, Stockton and Modesto.

The station is owned by Tegna ... and Nexstar Media Group recently announced

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