Chilliwack firefighters battled to gain access to a fire beneath the Yale Road overpass near Railway Avenue Friday.
Small explosions could be heard as crews tried to get water on the blaze.
Access was limited by fences built to keep people off the railway track, which runs under the bridge.
Thick black smoked curled upwards to Yale Road above.
A search of what appeared to be a homeless camp found no victims.
Watch theprogress.com for more information as it becomes available.