The man identified by media as 21-year old Philip Manshaus is formally suspected of murder in the death of his 17-year-old stepsister and of a "terrorist act" at the Al Noor mosque on Saturday, police said in a statement.
An armed attack at a Norwegian mosque will be investigated as a possible act of terrorism, police say.
The recent attack on a California synagogue demonstrates a symbiotic relationship between violence and media.
Norway is trying to overturn a ruling that the state violated Anders Breivik's human rights by keeping him isolated after he massacred 77 people in 2011.
Norwegian far-right mass murderer Breivik who killed 77 people wins human right case against state
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