UPDATE, 12:10p ET: Newborn baby Kayden Powell has been found in Iowa, police say.

The Associated Press reports:

Police say a newborn missing from a southern Wisconsin home has been found alive at a gas station in eastern Iowa.

Town of Beloit Police Chief Steven Kopp says the nearly week-old baby was discovered by an officer checking along an interstate near West Branch on Friday morning.

FBI acting special agent G.B. Jones said at a news conference the officer heard the newborn crying and discovered the child swaddled in a tote bag outside a gas station. Authorities say the child appears to be in good condition.

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Original Story:

A frantic search is underway in southern Wisconsin after a newborn baby was reported to have disappeared from his bassinet. The boy's 18-year-old mother, Brianna Marshall, called police at 4:30am local time Thursday to report that her son, Kayden Powell, had been taken while she slept in the same room. 

No suspects have been identified and there were no signs of forced entry, according to police in Beloit, near the Illinois border. The mother and 23-year-old father, Bruce Powell, are said to be cooperating.

Authorities say they've been questioning people who had been over the house the night before. The last time the days-old baby was seen was around 1:30am local time.

One woman who had been over the house Wednesday night was taken into custody on an unrelated warrant, but is not a person of interest in the disappearance. 

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Here's further details from AP: 

Kopp told the Beloit Daily News that the woman was visiting the home Wednesday evening but left early Thursday for Colorado where she lives. Police were able to reach the woman on her cellphone, and she pulled off the highway in Iowa. Authorities took the woman into custody on an unrelated outstanding warrant from Texas.

The incident is not believed to be a custody dispute, Kopp said. An Amber Alert was not issued because the disappearance doesn't meet the criteria, he said. The FBI and Wisconsin Department of Justice are assisting with the investigation.

Martha MacCallum discussed the case this morning with former NYPD homicide detective Bo Dietl, who said the first thing police should do is ask anyone who was at the house to take a lie-detector test. Dietl said that's a good way to quickly eliminate possible suspects.

Watch the discussion above as Dietl goes over all of the different scenarios that investigators will have to look at.