Majority of the residents of the lodge are from western UP and all its records have been seized. We are know looking for Ashish', a police official said.

A Pakistani passport, a Jammu and Kashmir voter identity card and some explosives were recovered from Salim.

He had been sent to Lucknow to take charge of the 'sleeper modules' of the LeT in the eastern region of the state.

'An expert in computers, Salim is 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 name 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.