Los Angeles police said the stabbing occurred around 2:40 p.m. in the 7700 block of Melrose Avenue outside the shoe store.
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Bystander video, which has gone viral and is now the subject of a police investigation, shows the woman get stabbed after a fight involving several people erupted on the sidewalk.
A man is seen running away as the woman screams in pain.
The stabbing victim was transported to a hospital in unknown condition.
Footage prior to the stabbing showed another woman appearing to get punched in the face, leaving her bloodied. She appeared to be alert following the assault.
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Police said the stabbing suspect is believed to be the victim's partner, and are calling the case an incident of domestic violence.
The stabbing occurred as a crowd of people lined up outside the Foot Locker store for the latest Nike shoe release.