From AP:
The wildfires burning across Europe this summer have exposed a potentially deadly threat lurking beneath the blackened landscape: rusty bombs and mines from World War I and II that threaten crews responding to the flames.
Some of the weapons have exploded in the intense heat. Blasts have been reported in France, Belgium, Germany and the Netherlands, where a bomb-disposal team was dispatched to check a forest threatened by flames near a site of fierce fighting in the Limburg province in 1944. Steady temperatures and predictable rainfall once ensured that most buried weapons stayed dormant.