The probe of a badly-injured three-month-old boy leads to the arrest of an Atlantic City 26-year-old responsible for him.

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Lavarrel W. Thompson was charged Thursday with aggravated assault of the infant, accused of leveling the injuries by shaking him. A charge of endangering the welfare of a child was added. Both are second-degree counts, punishable on conviction by five to 10 years in a state prison and up to $150,000 in fines.

It's another step in an investigation that began October 25 when authorities say he brought the unresponsive infant to AtlantiCare Regional Trauma Center.

According to Acting Atlantic County Prosecutor Jim McClain, examination of the baby showed signs of head trauma. Doctors notified the county office of Crimes Against Children.

Thompson was apprehended at a friend's house in Pleasantville and sent to the Atlantic County Justice Facility in Mays Landing, with bail set at $100,000. The infant is undergoing continuing care at Children's Specialized Hospital in New Brunswick.

It's the second shaken-baby case to surface at the shore in the past two weeks. A Toms River babysitter was charged in the death of an infant earlier this month.