Security agencies continued to grill Akhtar Hussain Qutbuddin Ahmed, who was deported from Dubai on Saturday night after being arrested for allegedly trying to sell Indian nuclear secrets.

However, sources at Sahar International airport said authorities have not made much headway in the efforts to corroborate allegations made by the Dubai police.

Akhtar questioned by senior officers for the third consecutive day at a secluded place in the airport. The Central Industrial Security Force had been asked to provide security to the place where he is lodged. No one, including Airports Authority of India staff, is allowed in the area.

Akhtar, who was detained immediately after he landed at Sahar International Airport, is being interrogated by various security and intelligence agencies to establish if he has access to any official concerned with atomic energy establishments.

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Maharashtra Minister for State for Home Kripashankar Singh had on Sunday said that state police were not connected with the case. He had also said that an Intelligence Bureau team would soon arrive in Mumbai take the suspect to Delhi on Monday for further interrogation.