Erbach (dpa / lsw) – Unknown persons have disposed of large amounts of rubble in a forest near Erbach in the Alb-Donau district. A police spokesman said on Friday that witnesses discovered about one and a half cubic meters of sand, gravel and remains of tar and a concrete block on a forest path on Wednesday. The rubble therefore poses a threat to the environment. The police assume that someone previously cleaned up a commercial area and then disposed of the rubble in the forest. The officers are investigating an environmental crime.