India, April 7 -- The Delhi Police have arrested a 31-year-old man for callingthe manager of a coaching centre in Wazirpur and demanding Rs.21 lakh, threatening to carry out a bomb blast at the institute if the money was not paid, police said Monday.

According to police, the accused Bacchu Jha is a former professor of applied mathematics in medical colleges in Haryana and Bihar. On the extortion call Thursday, he impersonated Haryana's jailed gangster Vikram alias Papla Gurjar.

A complaint was filed on Thursdayand upon investigation, Jha was traced in Maharashtra's Nashik. A Delhi Police team arrested him on Sunday, police said.

"Originally from Bihar's Madhubani district, Jha has been linked to two similar extortion cases registered i...