Walking through autumn leaves with helicopter and sirens

The recording is a walk that starts at the location on the map but finishes 350m away amongst the buildings the other side of Alexandrinenstrasse. The path is covered with dry leaves of different colours and crosses one road. A helicopter flies over and sirens approach and then stop abruptly. I couldn't see the incident and don't know what was happening. Crows, a small flock of chattering sparrows and pigeons in flight are heard, particularly at the end.