Berlin: After an explosion at a police blasting site in Berlin’s Grunewald forest, a fire has broken out in the adjacent forest and is spreading, the fire brigade said on Thursday.An area of roughly 1.5 hectares was affected and further explosions have occurred. Residential areas are not in danger, however, according to firefighters."We will prevent that,” a spokesman said.Though there have been no casualties, Berliners are being told to avoid the area as far as possible.It is assumed that the extreme dryness in the area will influence the further course of the fire. The extreme heat expected on Thursday will be especially hard on the emergency services. Due to further explosions and flying debris, the fire brigade said it had not yet started extinguishing the fire, and the emergency services had initially withdrawn to about 1,000 metres away. (dpa)