Ten firefighters and two police officers have been injured after a resident used an unidentified object to cause a blast at an apartment block in Germany, a state interior minister in the country has said.
Security sources have told Reuters they are not ruling out the blast in the town of Ratingen was a targeted attack.
Firefighters and police were called to the building this morning after concerns were raised about two residents, the interior minister of North Rhine-Westphalia has said.
Herbert Reul added that when they forced open an apartment door, they found a fire and one of the inhabitants used an unidentified object to cause an explosion, the minister added.
State broadcaster ZDF has said a mother and son had been living in the apartment block and concerns were raised because their mailbox was overflowing.
Television footage from the scene showed police snipers positioned on a balcony across the road from the building as smoke poured out of a top-floor apartment.
Police have said a large scale operation is under way.
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Ratingen is located on the northeastern outskirts of Duesseldorf, the state capital.
Interior minister Nancy Faeser is expected to give a statement on the incident this afternoon, ZDF has reported.
