>AMSTETTEN, Austria (AP) – The children locked in the basement never saw the light of day for years.

A retired electrician has confessed to imprisoning his daughter for 24 years and fathering seven children with her in a windowless cell sealed by an electronic keyless-entry system, police said Monday.

One of the children died in infancy and was tossed into the furnace of what stunned Austrians have labeled a “house of horrors,” officials said. The suspect owned the gray stone apartment building, lived there with his family and rented the other units to relatives.

Austria is still scandalized by a 2006 case involving a girl who was kidnapped and imprisoned in a basement outside Vienna for more than eight years, and residents of this working class town west of the capital were puzzled as to how the latest instance could go undetected for so long.

Questions were being raised as to how the suspect – identified as Josef Fritzl, 73 – deceived neighbors, social workers and police for so long.

“How is it possible that no one knew anything for 24 years?” asked Anita Fabian, a teacher in Amstetten. “This was not possible without accomplices.”

Fritzl was placed in pretrial detention and faces up to 15 years in prison if charged, tried and convicted on rape charges, the most grave of his alleged offenses under Austrian law.

Police released Fritzl’s full name and photograph at a news conference Monday, after his identity was widely reported by media in Austria and elsewhere in Europe.

Fritzl was born in 1935 and was a young child when the Nazis annexed Austria before World War II.

His daughter, now 42, was 18 when she was imprisoned in the cell constructed deep beneath the family’s apartment in the building, said Franz Polzer, head of the Lower Austrian Bureau of Criminal Affairs.

“He admitted that he locked his daughter … in the cellar, that he repeatedly had sex with her, and that he is the father of her seven children,” Polzer told the Associated Press.

According to police, Elisabeth said she gave birth to twins in 1996 but one died several days later.

Police said the surviving children are three boys and three girls, the youngest of whom is 5. The oldest child is 19. DNA tests were expected to determine whether Fritzl is the father of the children, as he claims.

Investigators said they were trying to determine how the victims could have been hidden away for so long from other families in the building and everyone else in the town of 23,000 people.

Fritzl “managed to deceive everyone,” including his wife, Rosemarie, who apparently was unaware of the existence of the children in the cellar, Polzer said.

Fritzl had seven other children with Rosemarie, police said.

Officials said three of the secret children – aged 19, 18 and 5 – “never saw sunlight” until they were freed a few days ago.

Polzer told reporters that Fritzl was an authoritarian who took care never to allow anyone near the cellar. Hans-Heinz Lenze, a senior local official, said experts were trying to figure out if anything could have been heard beyond the cell’s padded, reinforced concrete walls.

Polzer said investigators believe Fritzl acted alone, but appealed to the public to come forward with information.

The daughter, Elisabeth, had been missing since 1984, and authorities said her father had concocted a cover story that she had joined a cult and disappeared. She was found by police in Amstetten on Saturday evening after police received a tip.

Police released several photos showing parts of the cramped basement cell, with a gaily decorated small bathroom and a narrow passageway leading to a tiny bedroom. Investigators said the keyless-entry system apparently kept the daughter from escaping.

Three of the children lived with the grandparents and were registered with authorities. Fritzl and his wife registered those children with authorities, saying that they had found them outside their home in 1993, 1994 and 1997, at least one with a note from Elisabeth saying she could not care for the child.

Authorities said the victims and Fritzl’s wife were under psychiatric care in an undisclosed location.

Lenze said the 5-year-old, a boy, appeared “cheerful.”

“Of course, they are very pale,” he added.

The shocking discoveries recalled the case from summer 2006, when Natascha Kampusch escaped after being largely confined to a tiny underground dungeon in a Vienna suburb for more than eight years.