A family friend charged with killing a baby girl and her grandmother told police he dropped the baby as he wielded a knife and the grandmother charged at him during a botched kidnapping, authorities said Friday. Raghunandan ‘‘Raghu’’ Yandamuri targeted the family for a $50,000 ransom because he knew both parents worked, and he left copies of a ransom note, according to a police affidavit filed in suburban Philadelphia.
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