"The body of the boy, from Praharajpur village near Pattamudai town, was retrieved in a decomposed state on the bank of Hansina river," Superintendent of Police (Kendrapara) Sarthak Sadangi said. �
"The kidnappers killed the boy and threw the body into the river," Sadangi said.
He said that ransom was the sole motive and the fear of getting caught made the kidnappers kill the boy.
The youths were caught after tracking the calls from their mobile phones made to the family, he said.
The boy was picked up from Praharajpur village by Sujit Pradhan, who was known to him.
Later Pradhan was joined by the four others who made calls to the boy's family demanding ransom of Rs 5 lakh from the victim's father who is a plumber based in Dubai.