Wildfires across Europe this summer are exposing a dangerous threat from unexploded bombs and mines left behind from World War I and World War II.

Some of the buried weapons have exploded because of the intense heat, with incidents reported in France, Belgium, Germany and the Netherlands.

Heavy rains earlier this year caused vegetation to grow rapidly, which later became fuel for fires amid extreme heat, drought, low humidity and strong winds.

The fires have forced mass evacuations and prompted bomb-disposal teams to inspect areas where old explosives may have been disturbed, CBS News has reported.

Experts warn that climate change is increasingly destabilizing weapons that had remained safely buried for decades, creating new dangers for firefighters and communities.