Lt. Fred Wiste says a night nanny heard a noise, looked out a window and saw a cargo van speeding away around 3 a.m., but did not call police or go outside to investigate.
Officers have no suspects.
Suleman, an unemployed single mother of 14 children, has endured much public scorn in the weeks since giving birth to octuplets on Jan. 26.
Kaiser Permanente Bellflower Medical Center says the seventh octuplet was discharged Wednesday. Josiah weighed 4 pounds, 8 ounces when he went home.
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