The child, believed to be around 1 year old, was left in a room sleeping by himself as his mother was working out in the Zumba studio in North Hollywood, witnesses said.
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He apparently fell into a mop bucket, witnesses said.
Paramedics were called to the facility at 11:18 a.m. on a report of a non-responsive boy. The child was transported to a hospital and pronounced dead.
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Per the agency's protocol in child death cases, the Los Angeles Police Department's Abused Child Unit is investigating the circumstances.