Deadly shooting takes place at Russian intelligence agency

A fatal shooting in Moscow was reported after Russia's president held his annual press conference.
2:05 | 12/20/19

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Transcript for Deadly shooting takes place at Russian intelligence agency
There's also major news overseas tonight, a deadly shooting in Moscow near the heavily fortified headquarters of Russia's secret police. Cell phone video capturing the sound and the shots. People running through the streets there. Some people believed to be injured and the gunman has been neutralized. ABC's Ian Pannell in Moscow with late reporting tonight. [ Gunshots. ] Reporter: Tonight, an attack in the heart of Russia's state security. A lone gunman opening fire just before 6:00, outside the headquarters of the feared fsb, Russia's successor to the K fw B. Eyewitnesses capturing the terror as shots rang out in the streets around the fsb's notorious lubyanka building. Panicked crowds fleeing. We've seen dozens of police now converge on the intelligence headquarters as they try and take down this armed assailant. The police say they've got it under control. It's still a very active scene. This man says he saw the gunman, dressed in black, shoot a traffic cop. One officer seen lying motionless in the street. Five people wounded, an fsb officer dead. The gunman killed. Tonight, his motive is unknown. But there are fears this was a terrorist attack. And as the chaos unfolded, less than half a mile away, president Putin, the ex-head of the kgb himself, was honoring his former comrades, toasting their success in stopping extremist attacks. So, let's get to Ian, with us live tonight from Moscow. And we know Russia has seen many terrorist attacks before. What will investigators be looking for in this case? Reporter: Yeah, David, I think there are two possibilities. One, as you suggest, is terrorism, although there hasn't been a terrorist attack here in Moscow for at least five years. The second is that somehow this was some kind of disgruntled former fsb officer. Friday is national fsb day, that's something investigators will look at, but either because, this was an unprecedented attack at the heart of Russia's state security. David? Ian Pannell reporting from Moscow tonight. Ian, thank you.

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

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