Chandigarh, June 20 -- Nearly four chemists and jewellers have received extortion calls since June 13 killing of a Sector 11 chemist's cashier, police said on Friday. No FIR has been registered as these cases are being looked into and the security around vulnerable business establishments has been beefed up, officials, wishing not to be named, said.

Officials believe that some of the callers may be cyber fraudsters while other calls are believed to have originated from gangsters seeking to cash in on the atmosphere of fear created by the sensational murder.

The pattern is similar to neighbouring Panchkula where six businessmen, including club owners and liquor contractors, received extortion calls after the June 5 attack on club owner R...