It was nearly 10 p.m. on New Year's Eve, 1982. Two officers on New York Police Department's elite bomb squad rushed to headquarters at One Police Plaza, where minutes earlier an explosion had destroyed the entrance to the building. Lying amid the carnage was Police Officer Rocco Pascarella, his lower leg blasted off.

"He was ripped up like someone took a box cutter and shredded his face," remembered Detective Anthony Senft, one of the bomb-squad officers who answered the call 25 years ago. "We really didn't even know that he was a uniformed man until we found his weapon, that's how badly he was injured."

About 20 minutes later, Mr. Senft and his partner, Richard Pastorella, were blown 15 feet in the air as they knelt in protective gear to defuse another bomb. Detective Senft was blinded in one eye, his facial bones shattered, his hip severely fractured. Mr. Pastorella was blinded in both eyes and lost all the fingers of his right hand. A total of four bombs exploded in a single hour on that night, including at FBI headquarters in Manhattan and the federal courthouse in Brooklyn.

The perpetrators were members of Armed Forces of National Liberation, FALN (the Spanish acronym), a clandestine terrorist group devoted to bringing about independence for Puerto Rico through violent means. Its members waged war on America with bombings, arson, kidnappings, prison escapes, threats and intimidation. The most gruesome attack was the 1975 Fraunces Tavern bombing in Lower Manhattan. Timed to go off during the lunch-hour rush, the explosion decapitated one of the four people killed and injured another 60.

FALN bragged about the bloodbath, calling the victims "reactionary corporate executives" and threatening: "You have unleashed a storm from which you comfortable Yankees can't escape." By 1996, the FBI had linked FALN to 146 bombings and a string of armed robberies -- a reign of terror that resulted in nine deaths and hundreds of injured victims.