Fire crews survey the damaged areas
Media playback is unsupported on your device
Video

Los Alamos fire crews will 'knock this fire out'

Firefighters battling the blaze threatening a top US nuclear weapons research lab are optimistic they are gaining control of the fire.

Crews have been battling the blaze since Sunday, clearing brush and flame-retardant foam to hamper the spread of the blaze.

Matt Williams, Los Alamos Fire Department told reporters "we are doing what we can and we're knocking it down and getting a handle on it".

Go to next video: Small fire inside US nuclear lab