The Crime Branch of Delhi Police arrested the youth identified as Dheeraj Bhardwaj, a resident of Najafgarh, last night after laying a trap, they said.
According to police, Bharadwaj had on May 19 demanded Rs 10 lakh from a specialist doctor, who had treated him, and threatened him of eliminating him and his family members, if he didn't pay the money.
"He was inspired by a South Indian film in which an actor, posing as underworld don, extorts money from victims after sending the photographs of his family and threating to kill them.
He had identified the specialist doctor as his potential victim during his visit to a hospital for treatment.
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"Just like the film plot, he then shot the photographs of the victim. He also allegedly followed the doctor to his residence and took photographs of his family members. He then made threatening calls for extorting money. On May 19, doctor received an envelope containing photographs of his family and thereafter, he received threatening calls. He used to call from PCOs," the official added.
"After completing his 10th, Bharadwaj did his diploma from ITI. But, he could not get appropriate job and his family was facing financial hardship following which he and his juvenile associate, who is yet to be arrested, got an idea to extort money after watching a South Indian film," officer also added.