After the interrogation of two detained teenagers, the investigators hold the view that the blast was a "religious motivated terror of the Islamist scene", Essen's police commissioner Frank Richter said yesterday.
The blast ripped through the entrance hall of the gurudwara on Saturday evening during a wedding ceremony and severely damaged part of the building besides shattering windowpanes and injuring three persons, including the priest.
It also must be investigated who are the other persons with whom the two terror suspects had contacts, he said.
Jaeger said it was "entirely new" that the Sikh community in this country has become the target of a terror attack.
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The two terror suspects' affiliation to a particular group cannot be established at the present stage of the investigation, Richter told a news conference in Essen.
He is known to the authorities as an activist in the Islamist scene in the Ruhr region of NRW. He also has close links to "Lohberger-Brigade", an alliance of radical Islamists in the town of Dinslaken, the report said.
Photos and video sequences of CCTV footage showing the two men released by police on Wednesday helped the authorities to apprehend them, Richter said.
They are believed to have planted an explosive device hidden in a backpack in the entrance hall of the gurudwara. It went off at the end of the marriage ceremony.
More arrests in this connection cannot be ruled out, Richter said.
He assured the Sikh community that they can feel secure in the city and the authorities would do everything to protect them.