Los Angeles police said the person was detained around 11 p.m. Tuesday. No details were immediately provided as to how officers came upon detaining the man.
The person is a potential suspect but has not been booked on any charges at this time.
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Surveillance video from the attack at the open house shows a man violently pushing the realtor to the ground and then standing over her as she screams. The woman in the video said she was groped by the man.
The woman remembered seeing the suspect a week before at another open house.
Several times during the confrontation, the man looked at a home security camera, which captured an image of his face.
The woman said the man appeared to become frustrated by her refusal to take him inside, and moments after shaking her hand, the man suddenly lurched forward and shoved the woman to the ground as she screamed.
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The woman fell, hurting her back and suffering severe abrasions.
The man quickly took off on foot after the attack.
Los Angeles police have asked for the public's help in identifying the suspect.
The investigation is ongoing.