The police are reportedly suspecting terrorism motives in the attack that occurred in a store in Oslo on Thursday, NRK broadcaster reported citing police.
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The attack occurred in the city centre when a woman was buying groceries at a shop. Her condition has been described as critical.
According to the reports, the man arrived in Norway from Sweden on Thursday and on the same day, the conducted the assault.
Responding to the reports, the press attache of the Russian Embassy in Norway, Timur Cherkanov, said that the diplomatic mission knows who a Russian citizen detained over a knife attack in Oslo is, and is looking into the situation.
He also noted that the Russian diplomatic mission was in touch with Norwegian law enforcers.
The official added that, according to their information, a Russian citizen was detained on Thursday in Oslo after stabbing a woman in a shop.