NEW YORK (AP) — The man charged with opening fire on subway riders on train in Brooklyn was ordered held without bail as prosecutors told a judge Thursday he terrified all of New York City.

Frank James, 62, had a subdued demeanor during the brief proceeding in a federal court in Brooklyn, softly answering standard questions about whether he understood the charges and the hearing. His lawyer later asked the public not to prejudge him.

James was arrested in Manhattan after calling a police tip line to say where he was Wednesday, a day after the harrowing attack.

Authorities say he unleashed smoke bombs and dozens of bullets, in a train full of morning commuters. He’s charged with a federal terrorism offense that applies to attacks on mass transit systems — authorities say there’s currently no evidence linking him to terror organizations and are still trying to derive a motive.

Outside the courtroom, defense attorney Mia Eisner-Grynberg cautioned against “a rush to judgment.”

“Initial reports in a case like this are often inaccurate,” she said. She credited James with alerting police to his whereabouts, 30 hours into a manhunt that included cellphone alerts to the general public.

Once he knew he was wanted, “he called Crime Stoppers to help,” Eisner-Grynberg said.

She had agreed to his being held without bail, at least for now. His attorneys could seek bail later on.

At the request of James’ lawyers, Magistrate Roanne Mann said she would ask the federal Bureau of Prisons to provide James with “psychiatric attention,” as well as magnesium tablets for leg cramps, at the federal lockup in Brooklyn where he’s being held.

James didn’t respond to shouted questions from reporters Wednesday as he was led from a police precinct into a car headed for a federal detention center.

Authorities say a trove of evidence connects James to the attack. His bank card, his cellphone and a key to a van he had rented were found at the shooting scene. Officers also found the handgun they said was used in the shooting; tracing records show James purchased the gun from a licensed gun dealer in Ohio in 2011.

James, born and raised in New York City, had recently lived in Milwaukee and then Philadelphia.

Investigators were examining many hours of videos that James posted on social media, including one a day before the attack, in which he delivered profanity-laced diatribes about racism, society’s treatment of Black people, homelessness and violence. He also talked about his history of psychiatric treatment, and he complained about how New York’s mayor is dealing with homeless people on subways and with gun violence.

He also talked about shooting people, prosecutors noted in court papers.

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Associated Press journalists Jim Mustian, Michael R. Sisak and Jennifer Peltz contributed.