GILBERT, Ariz. - A gunman, identified by local media as a prominent border militia leader and a reputed neo-Nazi, shot dead four people including a toddler girl in Arizona on Wednesday before apparently committing suicide, police said.

The gunman opened fire in a house in Gilbert, a suburb of Phoenix, Gilbert Police Sergeant Bill Balafas said. He could not immediately confirm the identity of the gunman.

The Arizona Republic newspaper, citing unnamed police sources, identified the suspected shooter as Jason "JT" Ready, a reputed neo-Nazi who founded the US Border Guard, a militia that hunts for drug traffickers near the Mexican border.

The youngest victim, a girl of between one and two years old, was still alive at the scene, but later died in a hospital, Balafas said. The other dead were two men and two women. Police believe the shooter was among the dead.

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