Prosecutors plan to seek a decades-long prison sentence for a man who is expected to plead guilty this week to opening fire in a subway car and wounding 10 riders in an attack that shocked New York City.

Frank James, 63, is scheduled to enter a guilty plea on Tuesday in Brooklyn federal court, admitting that he was responsible for the April 12 attack. It set off a massive 30-hour manhunt that ended when he called the police on himself.

Prosecutors told Judge William F. Kuntz II in a letter late last week that they plan to ask him to go beyond the roughly 32-year to 39-year sentence that federal sentencing guidelines would recommend. James planned the attack for years and endangered the lives of dozens of people, prosecutors said in the letter.

Defense attorneys did not immediately respond to a request for comment on Monday, when courts were closed to observe the New Year’s holiday.

James had been scheduled to stand trial in late February.

His lawyers informed the judge on Dec. 21 that James wanted to plead guilty. Prosecutors say he plans to plead guilty to 11 charges without a plea agreement.

Ten of those charges — each one corresponding to a specific victim — accuse him of committing a terrorist attack against a mass transportation system carrying passengers and employees.