Aerial view looking down on a densely-packed commercial district in Los Angeles, California,

Aerial view across tall buildings and skyscrapers including the California Bank and Trust building in downtown Los Angeles, California, USA.

Aerial shot from The Peak looking over Hong Kong Island and across to Kowloon.

A huge black cloud of smoke rises in the distance.

Black smoke clouds rising over a train on fire.

Aerial alongside skyscrapers at sunrise in downtown Los Angeles, California, USA.

Aerial alongside skyscrapers including 1,018 feet tall US Bank Tower (Library Tower, First Interstate World Centre) at sunrise in downtown Los Angeles, California, USA.

Aerial view over central London, England. The Post Office Tower (also known as the BT Tower) is prominent.

Aerial view across tall buildings and skyscrapers including the 1,018 feet tall US Bank Tower (Library Tower, First Interstate World Centre) and the Mellon Bank Centre in downtown Los Angeles, California, USA.

Front view of a train on fire. Black smoke clouds rise above the train.

Back shot of two armed men watching black smoke clouds rise above a train on fire.

Aerial view over St Paul's Cathedral and the surrounding buildings in central London, England.

Aerial alongside skyscrapers at sunrise in downtown Los Angeles, California, USA. Zoom in on the mirrored windows of one skyscraper reflecting the sunrise and the camera helicopter.

Aerial view looking down on tall buildings, including the 1,018 feet tall US Bank Tower (Library Tower, First Interstate World Centre), interspersed by busy streets in downtown Los Angeles, California, USA.

Thick clouds of grey smoke rising into the sky.

Medium close up of highrise buildings shrouded in smog in Hong Kong. Camera zooms out to reveal a Chinese pagoda.

Thick clouds of grey smoke rising into the sky as a volcano erupts.

Aerial view across tall buildings and skyscrapers including the California Bank and Trust building in downtown Los Angeles, California, USA.

Thick clouds of grey smoke rising into the sky as a volcano erupts. Rock from the volcano crumbles into the molten lava below.

Thick clouds of smoke rising into the sky as a volcano erupts.