San Francisco police officers are investigating the cause of a collision that involved seven cars at Sixth and Harrison streets on Friday at about 3:55 p.m.

Ten people were either treated or taken to local area hospitals. All suffered non-life-threatening injuries, according to SFPD.

Hélène Goupil is a former editor at Mission Local who now works independently as a videographer and editor. She's the co-author of "San Francisco: The Unknown City" (Arsenal Pulp Press).

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