The trio, believed to be close to fugitive Indian Mujahideen chief Yasin Bhatkal, were apprehended by Delhi Police's elite anti-terror unit Special Cell, a senior police official said.
Police have recovered some arms and ammunitions from the arrested persons.
Sources said the trio were allegedly involved in the four low-intensity bomb blasts that had taken place in Pune in August this year, in which one person was injured.
Police had on March 27 arrested another suspected Indian Mujahideen terrorist, an alleged aide of Bhatkal, from north-east Delhi with one kg explosives and a detonator.
Assadullah Rehman alias Dilkash (20) was apprehended from Chandu Nagar in Karawal Nagar.
Dilkash, who hails from Darbhanga in Bihar, had allegedly escaped in November last year from the arms factory run by Indian Mujahideen in west Delhi's Nangloi before the police crackdown during which a number of suspected terrorists were nabbed by police.
The official said Dilkash had told police that he had recently taken on rent a premises at Chandu Nagar from where investigators allegedly recovered one kg of explosive powder, a detonator, a timer and a mobile phone.
"He came in contact with Mohd Kafeel Ahmad, the motivator and ideologue of Indian Mujahideen, who was arrested earlier. He was motivated by Ahmad to join Indian Mujahideen. In February 2011, Ahmad introduced him to Bhatkal who further motivated him," the official said.
In April last year, the official said, on instructions from Bhatkal, he reached Delhi and was taken to the factory at Meer Vihar in Nangloi which was later busted by police.
There he learnt to work on the lathe machine and assisted Mohd Irshad and Bhatkal in allegedly manufacturing pistols and other arms and ammunition. "He became a trusted aide of Bhatkal," the official claimed.
