Berlin police ammunition depot exploded, causing a huge fire that firefighters could not control in the famous forest west of the city.

“There are still explosions coming from the ammunition depot near the Grunewald forest. The situation is unpredictable. The fire in the forest is currently out of control,” a Berlin fire brigade spokesman said today

The moment the ammunition depot exploded, causing a forest fire in Berlin, Germany on August 4. Video: Twitter/Drazam3 3.

Explosions from a police ammunition depot caused the fires to erupt violently, as Germany was experiencing a new heat wave. The fire quickly engulfed the 15,000 square meter forest, while firefighters were unable to get any closer because of the risk of explosion from the ammunition depot.

Authorities are setting up a security fence to allow firefighters to start putting out the fire from a distance of 1km from the ammunition depot. A police helicopter circled the area, while officials urged people to stay away from the scene.

Firefighters approach the scene of a forest fire in Berlin, Germany on August 4.  Photo: AFP.

Firefighters approach the scene of a forest fire in Berlin, Germany on August 4. Photo: AFP .

Firefighting efforts are further hampered as Germany experiences a new heat wave, with temperatures expected to reach 40 degrees Celsius in many areas. In Berlin, the temperature is predicted to reach 38C.

Brandenburg, the area around Berlin, has been battling wildfires for days.