updated 8/24/2009 6:59:30 PM ET 2009-08-24T22:59:30

The skeletal remains of two infants have been found in a box and a storage container under an abandoned mobile home porch in rural northern Texas — a year after another baby's remains were discovered in a suitcase in a nearby field, officials said Monday.

A land owner who rents mobile homes to several people on his 5-acre lot was cleaning Sunday when he found some bones in a box in a plastic bag and others in a plastic storage bin, said Tarrant County Sheriff's Office spokesman Terry Grisham.

Authorities plan to compare the infants' DNA samples to that of the other baby whose remains were found last year in a suitcase in a field on the same lot, Grisham said. In that case, the medical examiner was unable to determine a cause of death, and authorities had no leads because they could not identify the baby or say whether a crime had occurred, Grisham said.

The brother and sister who lived in the mobile home for about three years before recently moving out denied knowing anything about the remains found Sunday and said they were surprised to hear about the discovery, Grisham said. They have been cooperating with authorities and have not been charged with any crime, officials said.

Authorities were still investigating how and when the infants died, said Dr. Roger Metcalf of the Tarrant County Medical Examiner's Office. He said a report could take several days, but a cause of death may never be determined depending on the state of decomposition.

"We'll have to look at the evidence to see if it was a fetus, stillborn birth or was born alive," Metcalf told The Associated Press.

Detectives also were trying to find out if anyone else stayed at the mobile home or lived there before the brother and sister, Grisham said.

Crime scene tape surrounded the gray mobile home on Monday as county workers cut down 3- and 4-foot-high weeds and brush. Some chairs remained on the front porch of the trailer near the community of Rendon, about 20 miles south of Fort Worth.

"We're looking for any type of evidence such as clothing or any more remains," Grisham said. "We'll be out here as long as we need to be."

Bo Pavelka, 29, who lives across the street from the trailer, said he had seen a man play with a dog in the yard but had never talked to him.

"I'm curious and worried about who it is," said Pavelka, who has two young children and a third child on the way. "Is it some girl having a baby and then throwing it out, or someone taking babies? We need to find out what the hell is going on."

Copyright 2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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