Sheriff's deputies and paramedics were called to a home in the 4100 block of Lemonberry Place in Thousand Oaks on the morning of Nov. 29.
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They found a 4-year-old girl that they say was suffering from "severe injuries caused by physical child abuse."
Firefighters performed CPR and then rushed the girl to a local hospital, where she was listed in critical condition.
Investigators spoke to the girl's father, 25-year-old Tekquan Alexander, and then arrested him for mayhem and felony child abuse.
They also executed a search warrant at the home. They say they found an unsecured assault rifle and a handgun in Alexander's bedroom.
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Alexander is prohibited from possessing firearms, according to the Ventura County Sheriff's Office, so he was also booked for weapons violations.
Alexander was booked and is being held on $500,000 bail.