A traffic nightmare unfolded on southbound 101 in San Francisco Wednesday morning following an initial collision that snowballed into multiple collisions and a 19-car pileup.

An alert went out from the SF Department of Emergency Management to avoid southbound 101 south of the Cesar Chavez offramp at 7:30 a.m. Wednesday, but by that point, traffic was already at a standstill. As Bay Area News Group reports, the first report of the incident came in at 6:49 a.m., though the cause of the initial crash is not clear.

CHP San Francisco Public Information Officer Mark Andrews confirmed that a "domino effect" occurred leading to at least six collisions and a 19-car pileup, which took until around 9 a.m. Wednesday to clear out.

Andrews said that one person was taken to the hospital with minor injuries, though the person was not visibly injured.

Otherwise this was just a lot of damaged cars and some maddening traffic for anyone trying to get through/south of the city this a.m.

An investigation is taking place as the initial events triggering the pileup.

Photo courtesy of CHP San Francisco

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