The arrest of two doctors, who appeared for the MD entrance examination on Sunday, for allegedly trying to cheat has led police to another doctor - hailing from Ujjain - who might be in touch with accused Mohit Chaudhry and Ravi.

Ravi, a medical student from Palwal, is now on the run. "The interrogation of the two has revealed that their association with this doctor was not a coincidence. There was a pattern in which the doctor chose his candidates. We have a team in Madhya Pradesh investigating their links,'' said a senior crime branch officer.

However, the police expressed apprehension that a few crucial evidences may have been destroyed with both doctors claiming they have disposed of the special shirts that came fitted with the bluetooth, earphones and SIM card that was used to keep in touch with the gang.

"We know that the accused had brought the mobile phones from a Connaught Place shop. We are interrogating them and trying to find out the area where the accused had disposed of these items. Since only a couple of days have passed, we are hoping to recover the items," said the officer.

Cops refuted claims of AIIMS authorities that they had come to the Noida exam centre to check genuineness of question papers seized.