The crash happened Wednesday morning on Old Route 22 at Pine Road in Tilden Township.
Authorities say a silver SUV swerved into oncoming traffic and struck a red SUV.
An off-duty nurse stopped at the crash and helped the victims.
But, she left before talking with police.
Investigators say four people, including two women, a 5-year-old boy, and a 4-year-old girl, were hospitalized with non-life-threatening injuries.
Anyone who knows the nurse is asked to contact Tilden Township police at 610-562-9001.
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