In the first case, the Delhi Police's Special Cell arrested 29-year-old Syed Mohammed Zishan Ali, suspected to be linked to the terror outfit. He was arrested at Delhi airport yesterday after being deported from Saudi Arabia.
The police were on the lookout for the suspect ever since three alleged AQIS (al-Qaeda in the Indian Subcontinent) operatives were arrested in 2015.
Ali was involved in assembling "disgruntled and radicalised" youths and training them at camps the AQIS was planning to set up in Delhi, police said.
The Special Cell got on Ali's trail following arrest of suspected AQIS members in December, 2015, who had revealed that Ali was a key member. He was even declared a proclaimed offender, they added.
One of the arrested AQIS men, Abdur Rehman, had told police that Ali was operating for the terror outfit from Saudi Arabia along with his brother Syed Mohammad Arshiyan alias Haider and brother-in-law Sabeel Ahmed, police said.
Ali is married to the sister of Sabeel Ahmed, who was arrested in connection with the 2007 Glasgow airport attack and later released.
Yesterday, the police were informed about 30 Indians, including Ali, being deported from Jeddah, Saudi Arabia due to visa violation. Ali was nabbed from the Indira Gandhi International Airport yesterday, said a senior police officer.
Ali, who belongs to Jamshedpur, was part of the network which was planning to create a terror base in the country, he said.
"There were plans to start training camps in the jungles of Jharkhand but their plan was foiled," said the officer.
In Saudi Arabia, Ali would pose as cell phone dealer or an employee of a private firm while carrying out his recruitment activities, police said, adding his links with Pakistan-based terror outfits were also being probed.
Raja-ul-Ahmed (25), with links to al-Qaeda, was the other man arrested by the Delhi Police on August 1 following a tipoff from the West Bengal Police.
A senior officer from the Delhi Police said Ahmed is wanted in a case of Fake Indian Currency Note (FICN) by the West Bengal Police, who alerted their counterparts here about his place of hiding.
Ahmed is a suspected member of Ansarullah Bangla Team (ABT), an al-Qaeda-inspired group in Bangladesh.