Blaze engulfs top of Moscow's Federation Tower complex

Russian fire crews have tackled a spectacular fire that engulfed the top of a Moscow skyscraper still under construction, BBC reported.

Helicopters helped douse the flames which broke out more than 60 floors up on the Federation Tower complex.

The fire - visible across the city - was brought under control after about four hours, Russian media said. The cause is not yet clear.

The complex is intended to be Europe's tallest building when completed.

First reports said the fire quickly spread through construction material and thermal insulation.

As workers evacuated the building, the fire appeared to die down but then broke out again and expanded.

There have been no reports of injuries.

The tower complex is designed to be 93 floors high and is due for completion by 2013.