CNN PRODUCER NOTE Londoner orbichambers was at Vauxhall Tube station en route to work when he spotted smoke rising from an area nearby. A helicopter had clipped a crane atop a building and plunged to the ground, killing two people and injuring several others, police later said. "We could hear all the sirens and you could smell the smoke as the train went past the site," he said. "The station announcers did tell us that there was a helicopter crash at Vauxhall and the engineers had to go check the tracks before we could leave."
- sarahbrowngb, CNN iReport producer