Sixty six candidates from Delhi and Haryana were arrested for allegedly cheating during a Staff Selection Commission exam held in Sikar district of Rajasthan by using a special bugging device fitted in their vest.

The arrested were caught using automatic mini mobile like bugging devices at the 28 centres where the exam was being held on Sunday, SP Sikar Haider Ali Zaidi said.

"The device had incoming facility only. Its minute receiver, not easily visible, was plugged into the candidates' ears. A person from outside, who had the list of answers, was dictating them in serial order," he said.

"Raids were conducted after some candidates were spotted with the devices outside the centres," he said, adding that the SSC officials had been informed about the incident.

Over half a dozen luxury vehicles were also seized during the raids, the SP said.

"The candidates are being interrogated to ascertain details of the gang involved in facilitating cheating in the exam," he added.