Moninder Singh Pandher, the man accused of kidnapping, sexually abusing and killing children in and around Noida, has two passports, the police has said.
Officers are investigating how he got the two passports and also how he has been using both to travel abroad frequently.
The investigating team has also recovered pictures of Pandher watching young boys and girls dancing nude.
Though his name in the first information report has been recorded as Moninder Singh Pandher -- the name found in the passport he got from Chandigarh -- the other passport, which he got from Ludhiana, is under the name Mohinder Singh.
Pandher and the other accused in the case -- his servant Satish -- will be taken to Ahmedabad for narcoanalysis tests on January 5.
Meanwhile, the father of one of the victims, Nand Lal, who highlighted the police inaction, on Thursday said he feared that the police might kill him in a fake encounter.
He said he had lost all hopes of finding his daughter, who had gone to see Pandher for a job on May 7.
He says, it was not the police, but a rickshaw puller who came to his rescue.
"He told me that my daughter had come to see the accused at Noida's Sector D-5 on May 7 around 4 pm and gave me the description of my daughter and the clothes that she was wearing. I took him home and showed her picture and he confirmed that it was my daughter he had seen," Lal told rediff.com.
"Sub-inspector Simranjit Kaur, who was looking into the case, drove down to my village Pipalia in Uttaranchal and told the village headman that my daughter had gone to Mumbai and was happily married," Lal, said.
Kaur was one of the six junior police officers the Uttar Pradesh government dismissed for dereliction of duty.
Lala also alleged that the Noida police had hounded him for filing a complaint against Pandher for kidnapping his daughter.