Philip Manshaus was arrested for attacking Al-Noor Islamic Centre in Baerum, on the outskirts of Oslo, on August 10, 2019. According to police, the man appeared to hold "far-right" and "anti-immigrant" views and had expressed sympathy for Vidkun Quisling – the fascist World War II leader of Norway – as well as Australian-born terrorist Brenton Harrison Tarrant, the perpetrator of the Christchurch, New Zealand mosque shootings, John T. Earnest the perpetrator of the Escondido, California mosque fire and the Poway, California synagogue shooting, as well as Patrick Crusius the man behind the El Paso, Texas Walmart shooting targeting Mexicans. He has been charged with attempted murder in this case and with the murder of his 17-year-old stepsister in an unrelated incident. The mosque shooting is being investigated as a possible act of terrorism.