Yes, your observations are sufficient evidence. As attorney Keller noted, contact the police
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I certainly agree with Attorneys Keller and Crawford but write separately to note my confusion. You indicate that the police and ambulance responded to the 911 call. Did you not speak with police at that time? By all means contact the local police and if not satisfied speak to the DA's Office in Lancaster County. Final step would be to enlist the assistance of a local attorney skilled and experienced in criminal practice.
From your question there is certainly enough evidence to support a criminal investigation and prosecution. If you have not already contacted the police you should do so immediately.