Uttar Pradesh police today said the kingpin of the gang involved in leakage of AIEEE question paper belonged to Jaunpur district and has base in Ghaziabad and Mumbai.

"The leader of the gang, which leaked the All India Engineering Entrance Examination (AIEEE) paper yesterday is a native of Jaunpur district with base in Ghaziabad and Mumbai, where he lived under pseudonym," Special Director General of Police Brij Lal told reporters here.

He said other members of the gang were from Sasaram and Patna in Bihar and Ahmedabad in Gujarat.

"Detailed investigation is being done and names of the accused are not being disclosed to maintain secrecy," he said.

He also said that assistant secretary of CBSE Karan Singh Saini has lodged an FIR at Hazratganj police station in this connection.

"The case is being investigated by the local police and information about the gang is also being collected by the STF," he said.

AIEEE question papers were leaked in Uttar Pradesh and reportedly sold for Rs 6 lakh yesterday forcing CBSE to postpone the test by over two hours and provide over 12 lakh students across the country with fresh set of questions.

UP Special Task Force's Senior Superintendent of Police Vijay Prakash had said they received a copy of the question paper on Saturday night.

An STF team has already nabbed a person in Kanpur in connection with the paper leak and took him to Lucknow for questioning. His identity was also not disclosed.