Three firefighters injured in an explosion at a timber yard were not prepared for the possibility of a blast, an inquiry has found.

More than a dozen firefighters were involved in tackling a blaze at James Jones and Sons timber yard in Moray in April 2014.

Believing the fire was extinguished, they went to help workers empty the waste wood silo where it began.

In the process, dust was dislodged and ignited, creating a jet of flame which shot through the silo's hatch and engulfed seven men.

A 59-year-old man was seriously burned and flown to Aberdeen Royal Infirmary by helicopter.

A Health and Safety Executive (HSE) report identifies seven factors which contributed to the accident.

Investigators said nobody was able to completely extinguish the fire and precautions to deal with back burning were not adequate.

Personnel were not wearing the proper protective gear and communications between fire crews and mill workers were "not clear", they said.

They noted the "potential for a dust explosion had not been considered and nobody was considering the remaining risk".

The Scottish Fire and Rescue Service and James Jones and Sons were told to take steps to prevent similar incidents in future, although the HSE said the situation was "not entirely foreseeable".