'A whiz in computers, Salim was a trained militant of the LeT. He had also received rigorous training in Pakistan. His admission to Lucknow University was a well-planned strategy of the LeT,' an ATS official said.

According to Maharashtra Police records, Salim's named surfaced after the arrest of three LeT terrorists, Mohammad Zubair, Mohammad Tanvir and Mohammad Amir, in 2006 from Aurangabad district.

Nearly 30 kg of RDX explosives and 10 AK-47 rifles were recovered from them. During interrogation, they revealed Salim's name. He was in Lucknow at that time.

'However, Salim managed to escape to Pakistan via Nepal. A few days ago, he again slipped into India through Jammu and Kashmir and was caught in New Delhi,' the ATS source added.

Earlier this month, Delhi Police arrested two suspected Hizbul Mujahideen terrorists from Daryaganj area of central Delhi.