New York blast suspect Akayed Ullah had began researching how to make bombs about a year ago, said Prosecutor Joom Kim.
Kim told reporters that metal pipes, pieces of wire and metal screws, which were consistent with the bomb materials were recovered from the suspect’s home in Brooklyn, reports the BBC.
The prosecutor said Akayed had admitted that he began researching how to build bombs about a year ago, and had been planning this particular attack for several weeks.
He had selected the location and timing “to maximise casualties,” Kim added.
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Akayed detonated a homemade bomb strapped to his body at the Port Authority Bus Terminal on Monday. He and three others were injured in the attack.
On Tuesday, he was charged with terror offenses over the bombing.
He was charged in a criminal complaint filed in Manhattan federal court with providing material in support to a foreign terrorist organization, bombing a public place, destruction of property by means of explosive and use of a destructive device.
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After the blast, Akayed told police interviewers that “I did it for the Islamic State,” according to court papers filed by federal prosecutors.
According to the documents, he also told investigators that he had been motivated by American air strikes on Islamic State targets.
The complaint stated that Akayed had used materials that included Christmas lights to make the device and it was affixed to his body with Velcro straps.
Akayed immigrated to the US on a family visa in 2011. However, his wife did not join him in the US.
Inspector General of Police AKM Shahidul Hoque said Akayed had no criminal record in Bangladesh and had last visited the country on September 8.
Trump has taken the attack to drum support for his immigration ban, which, the White House said, would have prevented the attacker from entering the US.