"He was involved in many bombing incidents", Deputy Commissioner of Police (Special Cell) Pramod Singh Kushwaha said, according to ANI.
Khan, wanted in several terror attacks cases, was on the run after his escape during an encounter at a residential building in Delhi, along with some fellow terrorists in 2008.
Ariz Khan is said to have been involved in serial bomb blasts in Delhi on September 13, 2008. The encounter saw the arrest of two IM terrorists and two others were killed. Encounter specialist and Inspector Mohan Chand Sharma, who led the police action, was also killed during the operation.
Khan had, however, managed to escape from Jamia Nagar. Initially, he tried his hand at running a restaurant but later started teaching in different schools in Nepal. He was also allegedly involved in five bomb blast cases including the ones in Jaipur, Ahmedabad, and Delhi.
Delhi Police announced Rs 5 lakh as a reward for the information leading to Khan's arrest.
Some of Khan's accomplices had links with the Islamic State - the radical Islamist group, the police said.
A month later they separated and Khan crossed over to Nepal. He was scheduled to meet a contact in UP when he was caught, added the officer.
He remained in Nepal till 2014 and during this period he came in touch with Riyaz Bhatkal who motivated him to come to Dammam, Saudi Arabia for arranging money to revive the IM in India, he said.