Bangladesh's police chief told Reuters late on Monday that 27-year-old Ullah had no criminal record in his home country, which he last visited in September.
The device malfunctioned and went off prematurely, severely wounding the suspect and leaving three other people sustained minor injuries in the attack.
It was his first court appearance since he allegedly detonated a pipe bomb in a subway passageway near the Port Authority Bus Terminal in what prosecutors described as a bungled suicide attack carried out in the name of ISIS.
A would-be suicide bomber's rush-hour blast in the heart of the New York City subway system failed to cause the bloodshed he intended, authorities said, but it gave new fuel to President Donald Trump's push to limit immigration.
'Police are looking for his family, but so far they've not been able to trace them, ' said Abul Khair Nadim, the Chair of Musapur Union council, a local government body in the Chittagong division in southern Bangladesh, where Ullah's family originally lived.
He said Sanaullah, who hailed from ward number 9 of Musapur Union in Sandwip upazila of Chittagong district, passed away two years back in NY.
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Ullah was one of four people injured in the explosion and was questioned by law enforcement after being treated at New York's Bellevue hospital on Monday. Investigators said the suspect was seen on surveillance footage igniting the bomb. The Democrat said officials were exploring whether Ullah had been on authorities' radar, but there was no indication yet that he was.
Dhaka police officials earlier said Akayed's wife and parents-in-law were taken to the Counter Terrorism and Transnational Crime unit office for interrogation. Sayfullo Saipov, the 29-year-old Uzbek immigrant who killed eight people in an attack in November, was living in the United States under a diversity lottery programme. He came to the US on an F-4 visa, a preferential visa available for those with family in the USA who are citizens or permanent residents. One video exhorted Islamic State sympathizers to carry out terror attacks in their homelands if they couldn't join the caliphate in Syria and Iraq. He was licensed to drive a livery cab between 2012 and 2015, but the license was allowed to lapse, according to law enforcement officials and New York City's Taxi and Limousine Commission.
The charging document said law enforcement personnel found a 9-volt battery inside Ullah's trousers pocket, wires connected to the battery running under his jacket and fragments of metal pipe.
John Miller, NYPD's Deputy Commissioner for Counterterrorism, said Tuesday on CBS "This Morning" that Ullah didn't seem to have any obvious problems.
"This was an attempted terrorist attack", Mayor Bill de Blasio said at a news conference Monday.
Akayed Ullah, 27, after he allegedly set off a pipe bomb in a NY subway station on Monday. "They are being interrogated", said Police.