Overview
- The blast on Monday in the Altenkessel district blew two manhole covers out of their fittings and damaged a building siphon, authorities said.
- Several nearby homes were evacuated as a precaution, with residents returning roughly two hours later.
- Police believe unknown individuals poured gasoline or a benzene-containing substance into the sewer before the ignition.
- How the substance ignited remains undetermined, and forensic work continues under the charge of causing an explosive detonation.
- No injuries were reported and the extent of damage has not been quantified; police appealed for witnesses at +49 681 9622133.