Daughter of Polish 'Fritzl' tells how she was kept a sex slave for six years and forced to have his children

The girl, who has only been identified as Alicja B, was only 15 when her father first raped her.

Over the next six years, she fell pregnant twice and was kept tied up in a locked room with no door handles.

She was taken to different hospitals to give birth while her father stood guard over the bed.

He then made her abandon her children in the maternity ward.

Polish policemen transport the handcuffed 45-year-old man in Siedlce after arresting him on charges of repeatedly raping his daughter over six years

'It was horrific,' she said. 'When I saw him in handcuffs, I just sighed with relief.'

The girls' father, who has only been identified as Krzysztof B, was arrested on Friday in the city of Siedlce, after his wife and daughter came forward with the allegations.

It emerged that the victim's mother knew what had happened but was repeatedly beaten by her husband to keep her silent.

The case bears a horrifying similarity to the case of Josef Fritzl, who police say has confessed to keeping his daughter captive for 24 years in a cellar below his home in Austria, sexually abusing her, and fathering seven children with her.

Police detained the 45-year-old Polish man on Friday in the eastern city of

He has been identified only as Krzysztof B., in keeping with Polish privacy laws. Police believe he was trying to flee the country when he was stopped.

"To some extent, this could be a similar situation to that in Austria," Sokolowski said.

Polish police will conduct tests on the boys to determine if the man is the father and are investigating whether to bring formal charges of forcible incest, regional police spokesman Jacek Dobrzynski said.

The man will be held for three months during the investigation, after which the court can extend his detention.

The man's daughter, now 21, told police that the man had raped her repeatedly while keeping her captive for six years in a room with no door handles, Sokolowski said. His wife corroborated the story, Sokolowski said.

New house of horrors? The house in Poland where the 45-year-old man has been accused of holding his daughter prisoner

Sokolowski said the girl was let out of the room on occasion, including for the births of her two sons in hospitals.

The first boy was born in February 2005 in the southwestern city of Wroclaw, and the second in January 2007 in the northeastern area of Siemiatycze, where the family had moved, Sokolowski said.

Josef Fritzl, above, has confessed to keeping his daughter prisoner and fathering her children. The new Polish case bears a horrifying resemblance to his crimes

Both times, the daughter told police, she was accompanied by her father, who then forced her to give the children up for adoption, the spokesman said.

Police are searching for the boys through the hospitals that placed them for adoption, and would conduct paternity tests on both, Dobrzynski said.

Police declined to provide further information and did not offer an explanation of why the mother and daughter did not come forward earlier.

"There are very many questions in the case, and talking to the woman is very difficult because she is very emotional about what has happened to her," Sokolowski said.

"The main problem was the extreme psychological pressure she was under, the intimidation," Sokolowski said. "We are also looking for people who might have known about the situation."

Adam Kozub, a spokesman for the investigating prosecutors, said they have questioned the man and his brother, who is also a suspect in the case. He refused to give any detail.

"It is a very disturbing story, but also a very delicate one because the victim is further suffering from the huge interest in her story," Kozub said.