Let's start with the horrifying helicopter crash in london. It occurred just across the river from the houses of parliament and big ben. Abc's lama hasan is live at the site of the crash with more.... See More
Let's start with the horrifying helicopter crash in london. It occurred just across the river from the houses of parliament and big ben. Abc's lama hasan is live at the site of the crash with more. Good morning, lama. Reporter: Good morning to you, elizabeth. A nightmare for commuters in central london this morning, as a chopper crashes into a crane on top of this building behind me, before plunging 60 stories and exploding into a ball of flames. On the streets, cars burning, and is people screaming and scrambling for their lives. Eyewitnesses saw a fireball dropping out of the sky, fearing the worst, another terror attack in london. A helicopter hit a crane in foggy weather, plunging to the ground, causing multiple casualties. Others were trapped in tunnels and burning cars. Tra crane parts are dangling from one of the tallest buildings in europe. I've never seen anything like it. Everyone was straight away, what was going on. They just ran towards the area. Trying to save anyone or help anyone. Reporter: Dozens of fire trucks, ambulances, trying to clear a very busy commuter area in south london, as the fire raged everywhere. The helicopter reportedly hit the crane on top of a luxury apartment building, right in the center of the city, near the houses of parliament and the intelligence building. I thought it was a bomb. I literally thought it was a bomb. It wasn't too foggy this morning. It was half past 7:00. A half an hour to an hour, it was really foggy. We have some fire. Get out of the car. Reporter: Victims were pulled out of burning cars. And rescue boats searched the thames river. The helicopter was being dive diverted through the fog. Air traffic control issued a warning of all pilots of the 772-foot crane. It's unaware if the pilot was aware of the danger. Witnesses reported gas in the area, creating fears the helicopter may have dumped fuel as it went down. The crash site is also very close to where the new u.S. Embassy is being built. For now, police have ruled out terrorism. But the entire area is swarming with police. And is now closed off.
This transcript has been automatically generated and may not be 100% accurate.