Kaufbeuren (dpa / lby) - Unknown perpetrators loosened wheel nuts on an ambulance in the Allgäu. The incident happened on Monday night during an operation, the police said. As the ambulance pulled away with a patient on board, paramedics heard a loud noise. They discovered that the lug nuts on both rear tires had been loosened. The ambulance was able to continue at a slow pace and deliver the patient to a clinic.