A WHITE nationalist Norwegian man who killed his stepsister and then opened fire on an Oslo mosque was today sentenced to spend more than two decades behind bars.

Philip Manshaus, who had told the court that he regretted not having caused more damage, “has proven to be an extremely dangerous person,” prosecutor Johan Oeverberg said as he demanded the maximum jail term of 21 years.

Mr Manshaus, 22, killed his 17-year-old stepsister, Johanne Zhangjia Ihle-Hansen, shooting her four times with a hunting rifle at their home in the Oslo suburb of Baerum last year.