Suspected gunman Philip Manshaus appears in court in Norway on Monday.
Suspected gunman Philip Manshaus appears in court in Norway on Monday. Credit: NTB via AP

A Norwegian man suspected of killing his stepsister and then storming an Oslo mosque with a gun appeared in court Monday with a smirk on his bruised face as evidence grew that he sought to emulate attacks by white supremacists in the U.S. and New Zealand.

Security experts believe Philip Manshaus is the latest example of an extremist who was radicalized by far-right conspiracy theories spread online, particularly the โ€œgreat replacementโ€ theory, which falsely warns of a โ€œgenocideโ€ in which white people are being replaced by immigrants and Muslims.

Manshaus, 21, was arrested Saturday after entering a mosque in the Oslo suburb of Baerum, where three men were preparing for Sundayโ€™s Eid al-Adha Muslim celebrations. Police said he waved weapons and fired several shots.

They did not specify what type of weapon was used. One person was slightly wounded before people inside the Al-Noor Islamic Center held the suspect down until police arrived.

Police then raided Manshausโ€™s nearby house and found the body of his 17-year-old stepsister, identified Monday as Johanne Zhangjia Ihle-Hansen, who was reportedly adopted from China as a 2-year-old. Manshaus is suspected in her killing, police said, but they did not provide details.

With signs of his struggle still visible in the dark bruises under both eyes and scratches on his face and neck, Manshaus entered a court in Oslo. In a closed-door hearing, he did not admit guilt and asked to be set free, his lawyer, Unni Fries, told the Associated Press.

The court ordered him held in pre-trial detention for four weeks, two of which will be in solitary confinement.

The head of Norwayโ€™s domestic security agency PST, Hans Sverre Sjoevold, said authorities received a โ€œvagueโ€ tip a year ago about the suspect, but it was not enough to act because they had no information about any โ€œconcrete plansโ€ of attack.

Sjoevold told a news conference that the agency and the police receive many tips from worried people every day and the information โ€œdidnโ€™t go in the direction of an imminent terror planning.โ€

โ€œMany of the people who have right-wing attitudes share a violent mindset, but experience shows that very few go from word to action. Therefore, it is a demanding mission to capture and prevent those who have the ability and will to carry out attacks,โ€ Stoevold said.

Norwegian media reported that Manshaus was inspired by shootings in March in New Zealand, where a gunman targeted two mosques, killing 51 people, and on Aug. 3 in El Paso, Texas, where an assailant targeted Hispanics and left at least 22 dead.

Dagbladet, one of Norway largest newspapers, reported that on the day of the attack, Manshaus wrote online that he had been โ€œchosenโ€ by โ€œSaint (Brenton) Tarrant,โ€ the Christchurch gunman.

Saturdayโ€™s attack came amid the rising popularity of far-right parties across the Nordics, fueled in part by a surge of migration into Europe in 2015. Groups that were once taboo have gained some social acceptance and influence. Extremists groups increasingly manifest their beliefs openly in ways that were once unheard of.