Knife-Wielding Terror Suspect Taken Down in Boston

Officers open fire on a suspect who had been under surveillance for suspected ties to ISIS.
2:06 | 06/03/15

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Transcript for Knife-Wielding Terror Suspect Taken Down in Boston
We begin in Boston. That dramatic terror takedown. A man who authorities say had been under 24-hour surveillance by the FBI, believed to have been inspired by Isis. Today, that 6'5" suspect, turning on authorities, they say coming after them with a military-style knife. They released this image of the knife today. They shot him dead. And this evening comes word of an arrest in the case and the number of searches under way right now. ABC's Tom llamas is on the scene in Boston. Yeah, they have a gentleman, black male, six feet, coming out now, armed with a knife. Reporter: Police transmissions capture the final moments a man allegedly armed with that large military knife charged an FBI agent and Boston police officer in this parking lot. All right, there's shots fired, units, shotted fired. Reporter: 26-year-old usaama Rahim had been under 24-hour surveillance by a terrorism task force that knew he was armed this morning. He was someone we were watching for quite a time. Reporter: At 7:18 A.M., the two officers confront Rahim in this CVS parking lot to question him about terror-related information. Police say Rahim then comes at the officers with the knife. The officers retreat backwards, ordering Rahim to drop the weapon. Police say Rahim gets dangerously close to the officers. That's when they both fire, hitting him in the torso and abdomen. Law enforcement sources telling ABC news, their inn vest gaiting whether Rahim, who lived in this roslindale apartment complex in Boston, had been inspired by Isis through the terror network's social media campaign. Rahim's brother, a local Imam, took to social media, claiming his brother was on his way to work when Boston police shot him in the back. The shooting comes months after this lone wolf terror-related attack in New York City. Surveillance video capturing this man attacking uniformed police officers with a hatchet before being shot dead by police. And David, tonight, there's been a new arrest in connection with the terror investigate that led authorities right here to Rahim. Sources are telling us that there are a number of related searches connected to this case, happening right now in Boston. David? Tom llamas leading us off from Boston tonight. Tom, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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