Allentown police are investigating a shooting early Friday that sent one person to the hospital.

Police say 32-year-old Stephen Zuber argued with his girlfriend, 30-year-old Ashley Johnston, and shot her while she was sitting in a car outside their home at 1621 Allen Street around 2 a.m.

Zuber then took the couple's three-year-old son from the car, went inside the home and forced a standoff with police.

After a brief negotiation, police took Zuber into custody.

He's facing charges of attempted homicide, aggravated assault, and endangering the welfare of a child.

After being checked out at Lehigh Valley Hospital-17th Street, the child is now in the custody of Children and Youth Services.

Johnston is listed in stable condition at Lehigh Valley Hospital-Cedar Crest.

There is no word on what sparked the shooting.