The Fire Brigades Union (FBU) will donate £20,000 raised by its weekly Firefighters 100 lottery to the victims of the Grenfell Tower fire.
At least 30 people, including children, have been killed in the most devastating fire in the UK for decades. Hundreds more have been made homeless.
More than 40 fire engines and 250 firefighters have, so far, responded to the fire that took hold in the early hours of Wednesday morning.
Matt Wrack, general secretary of the FBU, himself a former firefighter, said:
In over 30 years of working within the fire service, I have never seen a fire like this.
Firefighters want to do everything they can for the victims. We hope this donation will go some way towards helping those people affected.
Everyone who plays the Firefighters 100 Lottery will support this decision.
As well as the initial £20,000 donation, the lottery will use funds raised by future ticket sales to investigate, research and promote the lessons that must be learnt from this catastrophe.