Patna: A ransom of Rs.10 million has been demanded for the release of a school student kidnapped from Bihar's capital, his family members said on Thursday even as police remain clueless more than a week after the abduction.

Aditya Raj, the son of a farmer and a student of Class 12 in a Patna school, was kidnapped Feb 23 from near Moinulhaque Stadium here.

"We have received a ransom call twice in the last seven days," said Aditya's elder brother Sumit Kumar, who had lodged a case of kidnapping at Bahadurpur police station here.

Sumit said that kidnappers have threatened to kill Aditya if ransom was not paid soon. Police earlier refused to register a case but now say search operations are on. Aditya is the son of a farmer in Kesaria in East Champaran district.

"Aditya and Sumit were staying in a lodge to study for competitive examinations," police said. Police suspect Aditya's friend Sonu to be behind his abduction.