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After San Francisco Police Chief Bill Scott offered details on the incident on Friday, Politico reported that when officers arrived at the house, they "knocked on the front door and were let inside by an unknown person." This excerpt led to speculation that there may have been a third party.
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Authorities said they believe [42-year-old David DePape] broke in through the back door [and that] there were only two people in the home at the time of the break-in: Paul Pelosi and DePape. Police witnessed the suspect attack Paul Pelosi with a hammer. Paul Pelosi, who is 82, underwent successful surgery to repair a skull fracture and serious injuries to his right arm and hands. He is expected to make a full recovery.
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Although they have not stated a suspected motive, Scott said, “This was not a random act.” Journalists have dug into online posts believed to be from DePape, some of which reference the QAnon conspiracy theory. DePape had a bag containing zip ties, sources told CNN. The assailant [reportedly] shouted, "Where is Nancy?" after breaking into the home.