He is also suspected to have been involved in the Batla House encounter that took place in September 2008.
"He is an expert bomb maker, conspirator and executioner".
Khan had a bounty of 15 lakh on his head to arrest as reported India Today, as announced by the National Investigation Agency, had plans to revive the IM.
After the Batla House incident, he stayed in India for some time before fleeing to Nepal where he got hold of a Nepali citizenship card and passport in the name of Salim.
The arrested Indian Mujahideen (IM) terrorist, Ariz Khan was sent to 25 days of police remand by a Delhi court on Thursday.
"It's a big catch as Khan had been absconding since 2008", P.S. Kushwaha, Deputy Commissioner of Delhi Police, told the media.
"There he lived with Tauqeer aka Abdul Subhan Qureshi, who is his superior".
Accordingly, a team under ACP Govind Sharma laid a trap and nabbed Khan near the Sharda Inter College in Banbasa on Tuesday evening. His associate, Tauqueer, was arrested earlier by the Delhi Police in January this year, police said. While majority helped them with financial aid, they refused to provide them shelter.
Junaid, a resident of Azamgarh in Uttar Pradesh is an accused in five bomb blast cases.
Some of Khan's accomplices had links with the Islamic State terror group, the police said. "For a cover, he worked as a labourer and also met with many sympathizers there", Kushwah said. "How he was allowed to escape, now he has been arrested, they should explain how he escaped", the Congress leader said. A total of 165 people died in the incident he was involved in.