The FBI joined the search Friday for a newborn girl after her father found the baby's mother shot to death in their Kansas home, police announced.

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The father came home in Wichita Thursday to find Sofia Victoria Gonzalez Abarca had disappeared and his live-in girlfriend, Laura Abarca-Nogueda, was dead, police Lt. Todd Ojile said during a news conference. The child was believed to be in danger.

Investigators do not consider the father a suspect, Sgt. Nikki Woodrow added. The baby was just 6 days old when she vanished, Fox 4 reported.

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Police did not release the parents' names. They have not issued an Amber Alert because they have not identified a suspect, Woodrow said.

Investigators said they wanted to talk to anyone with a relationship to the victim.

Police sent out an alert Thursday night saying the driver of a purple Cadillac who was a person of interest in the case was found and questioned. He was not considered to be a suspect.

The FBI in Kansas City, Missouri, has deployed a team specializing in investigating child abductions, spokeswoman Bridget Patton said. She deferred additional questions to Wichita police, saying only that federal agents were "in an assistance capacity to Wichita."

The National Center for Missing and Exploited Children said Friday it has dispatched members of its "Team Adam" -- retired law enforcers -- to assist in the search for the baby girl.

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The Associated Press contributed to this report.