Belgium authorities were awaiting crucial air support Sunday to help battle the largest wildfire in the country’s modern history, which has been ablaze since Friday.

More than 250 firefighters and emergency personnel worked through the night in the High Fens nature reserve near the German border to stop the spread of the wildfire, which has scorched 3,000 hectares.

Firefighters said they are relying heavily on aircraft Sunday to bring the blaze under control, with reinforcements arriving from several European countries.