Police is investigating whether the 27-year-old suspected LeT operative arrested in the capital was part of a module planning terror strikes in Maharashtra during the festive season, sources said on Wednesday.
Investigations are also on to ascertain whether Yousuf, who was arrested from New Delhirailway station on Tuesday, had visited Pakistan-occupied Kashmir.
Delhi Police's Special Cell about an hour before he was to board a Nanded-bound train caught Yousuf. He was caught allegedly with four detonators, two timers and two kg of explosive chemicals.
"We have alerted Maharashtra Police about the arrest. However, we are yet to ascertain as to which place in Maharashtra Yousuf was headed to," a senior police official said.
The arrest comes at a time when people are celebrating Ganesh Chaturthi as well as observing fast during the month of Ramadan.
Sources said investigations are yet to ascertain his "exact role."
"He could just be a courier. He could be much more than that. We are interrogating him to know where he was going to, whom he was supposed to meet," the official said.
Sources said Yusuf, who came to Delhi from Jammu, hails from Poonch in Jammu and Kashmir and was believed to be headed towards Mumbai.
The suspected terrorist was carrying a Jammu and Kashmir identity card bearing the name Salim Mohammed as also a Pakistani passport bearing the name Yusuf, Deputy Commissioner of Police (Special Cell) Alok Kumar said yesterday.
He is the third terrorist to be arrested by Delhi Police this month. On August six, the Special Cell had arrested two suspected Hizbul Mujahideen terrorists from Daryaganj area in central Delhi.
Hizb militants Javed Ahmed Tantray and Ashiq Ali Bhatt had met their chief Syed Salahuddin a few months back in terrorist camps in Pakistan-occupied-Kashmir.
Police claimed that Salahuddin had asked them to unleash terror in the country ahead of Independence Day.
The arrested men had their arms and religious training in terror training camps in PoK and had met Salahuddin several times.