Phoenix detectives are checking hundreds of leads as they try to capture a serial killer who stalks victims while driving down darkened streets of poor, predominantly Latino neighborhoods.

The killer has been dubbed the Serial Street Shooter.

He has killed seven people and wounded two since March in nine attacks that have sown fear in Phoenix and led to a police plea for the public's help.

But the neighborhood where six of the killings happened has many immigrants who are reluctant to come forward for fear of deportation.

The gunman strikes only after sunset and before dawn. All but one of the killings have taken place in the city's Maryvale section.

The victims include a 12-year-girl who was shot to death along with her mother and a friend of the mother.