Police said the boy, a Class XII student, was traced to Old Delhi railway station by a police team.

“He went missing on December 21. His family did not lodge a missing complaint till December 23, the day when his father, a doctor, received an SMS demanding Rs 3 crore as ransom,” a police officer said.

During investigation, police traced the location of the boy’s mobile phone to Bardhaman district in West Bengal. Police said the boy’s father hailed from here.

“Though a team was sent to Bardhaman with the boy’s father, he could not be found. We also searched railway stations in Delhi and, during one of these searches, we found the boy at Old Delhi railway station,” the officer said.