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“The people whom we’re prosecuting have well crossed that line,” Adam Kaufmann, head of the district attorney’s investigative division, said Monday. “They’ve gone from sort of espousing an idea to creating a plan to act upon it.”

At an arraignment where Pimentel was ordered held without bail, prosecutors said investigators have “countless hours” of audio and video in this case. And in a criminal complaint, an intelligence division detective alleges Pimentel told him after the arrest that he was about an hour away from finishing the bomb and felt Islamic law obligates all Muslims to wage war against Americans to avenge U.S. military action in their homelands.

A former federal prosecutor praised the police and state prosecutors for going through with the investigation and charges.

“A person who puts out conspiratorial information and then takes steps to build a bomb should not be walking the streets of New York,” whatever his mental state or his interactions with an informant, said Michael Wildes, a former assistant U.S. attorney in Brooklyn who worked on terrorism-related cases. “Considering the facts that have been revealed to the public, the decision was done well, in this instance, to go ahead with this case and for the FBI not to be the lead agency.”

Publicly, NYPD and federal officials claim they have a strong working relationship. But behind the scenes, there has been tension ever since the department mounted its own aggressive anti-terrorism effort, including undercover investigations targeting potential homegrown threats.

The effort is needed, NYPD officials say, because the city remains a prime terrorist target a decade after the Sept. 11 attack. Mayor Michael Bloomberg said there have been at least 14 foiled plots against the city, including the latest suspected scheme.

The most serious threats came from Pakistani immigrant Faisal Shahzad, who tried to detonate a car bomb in Times Square in May 2010 and is now serving a life sentence, and Najibullah Zazi, who targeted the subway system a year earlier. Zazi pleaded guilty to federal terrorism charges and is awaiting sentencing.

Authorities described Pimentel as an unemployed U.S. citizen and “al-Qaida sympathizer” who was born in the Dominican Republic. He had lived most of his life in Manhattan, aside from about five years in the upstate city of Schenectady.

His mother said he was raised Roman Catholic. But he converted to Islam in 2004 and went by the name Muhammad Yusuf, authorities said.

“He appears to be a total lone wolf,” Mayor Michael Bloomberg said. “He was not part of a larger conspiracy emanating from abroad.”

Based on tip from police in Albany, the NYPD had watching Pimentel using a confidential informant for the past year. Investigators learned that he was energized and motivated to carry out his plan by the Sept. 30 killing of al-Qaida’s U.S.-born cleric Anwar al-Awlaki, police said.

Pimentel was under constant surveillance as he shopped for the pipe bomb materials. He also was overheard talking about attacking police patrol cars and postal facilities, killing soldiers returning home from abroad and bombing a police station in Bayonne, N.J., authorizes said.

Associated Press writers Colleen Long and Jim Fitzgerald contributed to this report.