Authorities told local media outlets that another woman and child were injured in the attack around 6:30 a.m. Sunday and taken to the hospital.
The names of the 35-year-old mother and the 1-year-old girl killed inside a car have not been released.
Police say they arrested the man, and he threw a gun as they asked him to show his hands.
The suspect's name has not been released.
Investigators are trying to figure out why the man attacked the woman and children.
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